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93 4X4 1500 Chevy 350 engine..


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alienshadow
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Feb 11, 2010, 7:09 PM

Post #1 of 44 (7118 views)
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93 4X4 1500 Chevy 350 engine.. Sign In

Hey I am having some issues here with my 93 chevy truck.. When at a stop light truck may sputter a little.. Also when giving gas and truck shifts into second it sputters sometimes.. I run 93 fuel it has new spark plugs new temp sensor new distributor cap.. I am not a mechanic but I have invested alot in this old truck.. It dosent cut off just sputters... I know its not a misfire because it would do it all the time correct?????
Any advice would be really helpful if you need more details please let me know.. Engine has been rebuilt and Trans also..




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Tom Greenleaf
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Feb 11, 2010, 7:53 PM

Post #2 of 44 (7111 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

There's a host of things that could cause this. Plug wires, contact to coil in cap, vacuum leaks and the list goes on. You are wasting $$ not getting it diagnosed which should be fairly easy and will probably trash VERY expensive converter(s) if you wait much longer. Penny wise can be pound foolish,

T
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alienshadow
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Feb 11, 2010, 8:40 PM

Post #3 of 44 (7103 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Thanks Tom but the problem is when I take it it dosent do it.. Go figure.. I am hoping if I replace the spark plug wires it will solve it..To expensive to get charged by the hour and not know no more than I know now...




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Tom Greenleaf
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Feb 11, 2010, 10:36 PM

Post #4 of 44 (7096 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Understood - If it won't act up when you test stuff it's guessing only which gets expensive -- Murphy's Law - it will be the last thing and most expensive item, it's a mechanical known! Kidding.

Try spraying (carefully as it can flash fire) carb cleaner looking for leaks. If one found it will change idle. Cool engine and don't over do it if attempted. That for vacuum leaks - hoses and gaskets to throttle body, intake to head gaskets and egr -- anything that seals vacuum could cause erratic issues and could be intermittent.

Spray slightly salted water on plug wires and high voltage items, again while on cool side and if dark you may see some arcing of electricity which is a problem area.

Clean out throttle body with carb or throttle body cleaner (same stuff really)

Keep looking. If codes available get them read for direction. They don't always say exactly what but can lead the way to the fix,

T
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nickwarner
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Feb 12, 2010, 10:04 PM

Post #5 of 44 (7086 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

By the way, you can save your money on the premium gas. Its not helping you. This engine was designed for optimum running on 87 octane. The octane number is a measurement of the fuel's RESISTANCE to burning. The reason hot rods and higher end cars run them is they have higher compression, superchargers, turbos, things which raise the cylinder pressures. So they need a fuel that is harder to light and doesn't burn as well to prevent preignition. Especially since these cars have more aggressive timing. Unless you've really hopped up the motor there is no reason to run this fuel. Believe it or not, you will actually run better on the regular 87 octane


alienshadow
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Feb 13, 2010, 6:10 PM

Post #6 of 44 (7077 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Thanks Nick, I started using 93 due to the sputter I thought my injectors were clogged.. So I put greased lightning in the tank which is a 12000 mile treatment.. Today I went out and bought a set of Accel spark plug wires part number 5114k.. I hope this solves my issue.. I had the trans man check his stuff out and no problems with it..I am at a lost as to what is causing this sputter and I am sick of putting money into this truck but I am a sucker for older trucks plus they are easy to work on... Nick the engine was bored out when it was rebuilt thats all I know that was done extra when the rebuilt took place.. Still use 87 right? Also any suggestions on the sputter would be great I will be putting the plugs on in the next day or so.. Spark plugs where changed back in the summer months so I will stick with them...




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nickwarner
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Feb 13, 2010, 8:23 PM

Post #7 of 44 (7068 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

I'd still stay with the 87. Your engine was bored out at overhaul because the cylinders were too worn to properly seal on stock pistons and rings. I had my 351W in a truck bored .030 because of this but the diameter of the piston, not the compression height, was all that changed. Therefore the compression ratio wasn't changed, just a few extra cubic inches of displacement were added. Those wires may not fix the immediate problem, but certainly can prevent future ones. They are a high quality set and will transfer good spark voltage provided the rest of the ignition system is up to the task. GM had a very good ignition system. It generates excellent voltage and as long as your plugs and wires are good you will have minimum troubles in that area of the system. I had actually looked at buying an MSD system and coil for my 95 Suburban and a sales rep from Summit Racing actually told me I wouldn't come out much farther ahead by doing so. Its that good of a spark. For all their flaws in certain vehicles, HEI ignition was one thing GM got right the first time.


alienshadow
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Feb 13, 2010, 8:33 PM

Post #8 of 44 (7066 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Okay I will.. Yeah I like to invest in good parts no need for cheap mess that dont last...As far as everything goes I know I have a new distributor cap new spark plugs. New egr valve.. New rebuilt trans.. New tires lol.. New heater coil..New belt. New air filter.. Supossely a rebuilt engine really not sure since I got shafted on the guy telling me the trans was rebuilt but it hadnt been.. I can see new seals and stuff on the engine but I cant see the inside.. Although the valves look real good..Oh yeah new hoses new windshield wiper fluid pump.. Front end alignment Got the steering wheel tightened up..

So as you see alot invested and the problems keep showing up.. I am glad the 4x4 works great.. I am in eastern N.C. so I dont use it much..
Nick if you have any other ideas on the sputter deal just let me know.. I think I may let it keep doing it if the wires dosent stop it.. Just let it get really bad and then I will know what the problem is from a mechanic...




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Tom Greenleaf
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Feb 14, 2010, 11:38 AM

Post #9 of 44 (7046 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Didn't see the distributor rotor mentioned when cap was replaced but as nick said GM's HEI was pretty good and dependable.

Wires or any ignition parts are not good to cheap out on. Wires can last ages and I find most fail to trauma from heat, rubbing or being stuck such that they get stressed from removing and replacing for any reason. Do them ONE BY ONE so as not to mix up firing order - longest to longest in box to shortest and secure them as they were originally in holsters which may break but you can get those.

Gasoline octane ratings: True - if designed for 87 then 87 should be fine. It's not necessarily a quality rating but an anti-knock rating. It takes a higher % of crude oil to make higher octane fuel so it will cost more than lower octanes.

Comment on cheaper parts: Ign stuff - not worth the savings at all! Filters - cheap ones can cost you MPGs especially air filter. Front end and brake parts. Most must meet OE specs but I don't care for much that is cheaper with those either. Shocks - a ha! Now - with trucks and certain cars the cheaper ones may ride better to your liking which isn't necessarily a quality issue but can be. I prefer the basic ones on trucks for my taste as they ride more to my liking with no load conditions.

Laugh - I own a 3/4 ton C/K truck and when empty it rides like a coal cart! Surprised it doesn't break glass!

T
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re-tired
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Feb 14, 2010, 1:01 PM

Post #10 of 44 (7044 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Hello A.S. I too own a 93 chevy pickup . It's got 240,000 miles and other than mainntenence items , tune up , belt and hoses only the valve cover gaskets , a water pump and a p/s pump have been replaced . The tranny was gone thru in order to put a heavy duty clutch pack for towing my boats . Anyway, twice in its life I had sputtering problems . Once my injectors started to dribble gas when at idle and a little when first shut down .Three tankfulls of injector cleaner took care of that , now it's added on a regular basis. The second was the EGR control soleniod. It was allowing small amount if vac to crack open the valve . You can check for this by removig the hose from valve and plugging off. Replace the solenoid if problem.BTW , I've always used 87 .


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chickenhouse
Enthusiast

Feb 14, 2010, 2:16 PM

Post #11 of 44 (7043 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Mines a 92 Z71 with 220,000 mi. Repairs include a water pump, wiper circuit board, rear wheel cyls, 2 clutches, plugs & wires. I can't think of anything else I've ever done to it. 87 octane-always.


alienshadow
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Feb 14, 2010, 2:28 PM

Post #12 of 44 (7042 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Mines has 293142 miles on it but with rebuilds... EGR valve new.. I will change these wires if it continues I will let it get worst.. This truck will eat me alive if I let it lol...
As far as the wires go back in the connectors when installed the ones there now have tie straps on them with a middle one seperating it.. I have bought what I need for it to be correct not sure where to put the spark plug seperators being they are tie strapped now.. Anyone have a diagram?




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re-tired
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Feb 14, 2010, 3:59 PM

Post #13 of 44 (7039 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Its not the EGR valve thats the problem its the control soleniod next to the tbi that controls the egr that you need to check . wire seperators go where ever their needed.


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alienshadow
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Feb 14, 2010, 4:06 PM

Post #14 of 44 (7037 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

I went out and looked at it the egr part that was replaced... re-tired it looks like a goldish color and is round...




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alienshadow
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Feb 14, 2010, 4:07 PM

Post #15 of 44 (7036 views)
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Oh and the check engine light has not come on I know it works..




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re-tired
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Feb 14, 2010, 4:40 PM

Post #16 of 44 (7032 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

often the egr prob will not trip lite.


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alienshadow
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Feb 14, 2010, 4:56 PM

Post #17 of 44 (7029 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Re-Tired there is definatly a hose that is not hooked to a black square box. It has a blue connection harnest on this box.. One hose comes from the egr valve which is gold goes through this black back out through to the engine.. The vac hose coming back to this square box has an end on it with a screw broke off in it, its not hooked up.. I was told not to worry about that line is this not true??? These hoses are very small...




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alienshadow
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Feb 14, 2010, 5:05 PM

Post #18 of 44 (7026 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

I cant find a diagram for this so I know what parts to ask for can anyone help???




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steve01832
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Feb 14, 2010, 5:51 PM

Post #19 of 44 (7023 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Not to change the subject, but that picture for your profile is quite disturbing.

Steve


alienshadow
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Feb 14, 2010, 5:58 PM

Post #20 of 44 (7022 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Sorry I see no forum rules on pics it has no nudity and no obsence jestures get over it!!!!!!




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Hammer Time
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Feb 14, 2010, 6:18 PM

Post #21 of 44 (7012 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In


Quote
get over it!!!!!!


You do realize that your talking to a Moderator?




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



alienshadow
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Feb 14, 2010, 6:23 PM

Post #22 of 44 (7008 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Yes I do.. No pun intended... If the moderator had an issue with my pic he should of emailed me in private and not made it public..




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steve01832
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Feb 14, 2010, 6:50 PM

Post #23 of 44 (7000 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Allen, this black box you're talking about sounds like the electronic vacuum regulator solenoid valve. It has a vacuum line going to the EGR and one going to the throttle body. It will also have an electrical connector housing a ground wire (Blk/Wht), a feed wire (Pnk/Blk), and a gray wire. The pink/blk wire and the gray wire both come from the PCM. Is this the black box you are referring to?

Steve


alienshadow
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Feb 14, 2010, 7:14 PM

Post #24 of 44 (6996 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

Yes its a small box that has a place for 2 vaccum hoses.. small ones only one is hooked up to it.. the other one has been capped off with a screw.. My mechanic said it didnt matter if it was hooked up or not.. I just wonder if that could be causing this sputter its not everytime but it happens? The box is right under the air filter housing...




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steve01832
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Feb 14, 2010, 7:21 PM

Post #25 of 44 (6990 views)
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Re: 93 4X4 1500 Chevy 350 engine.. [In reply to] Sign In

The hose coming from the throttle body is the vacuum supply to the solenoid. The computer will supply the power to the solenoid when the EGR needs to be opened. Once the solenoid opens, the vacuum line going out to the EGR carries the vacuum signal to open the valve. When either vacuum line gets disconnected, the EGR won't open at all. If the plastic vacuum port is broken off, you will need to replace it. The name of the part is EGR vacuum regulator solenoid valve. Hope this helps.

Steve




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