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1996 4.3L 1500 chevy problem
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johnstudstill
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Aug 6, 2009, 3:11 AM
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1996 4.3L 1500 chevy problem
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Its a 1996 Chevy PU with 5 speed manual transmission, with 152,000 miles. Truck ran great until it blew out the intake manifold gaskets. Somehow during the repair(some friends did it, I was out of town) another problem arose. Now its dead. Fuel pump works, starter works, will turn over all day, but has lost spark on 2 cylinders. Have replaced every component in the ignition system except the distributor, but did replace the cap and rotor and wires. Just for sh*t's and giggles I pulled the spider valve and found that two injectors had failed. I am out of ideas, and it’s a good truck. Please help.
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Hammer Time
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Aug 6, 2009, 3:22 AM
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Re: 1996 4.3L 1500 chevy problem
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The first thing you need to do is confirm whether it's spark or fuel causing the miss. I suspect it will be fuel. Once confirmed, you will have to verify the wiring to the injectors. They may have damaged a couple injector wires or the plug where they go in.
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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.
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johnstudstill
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Aug 6, 2009, 3:32 AM
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Re: 1996 4.3L 1500 chevy problem
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I used a spark checker to verify the spark, and I replaced every component in the ignition system except the distributor, and it has been the same ever since those morons did what they did. They did tell me that when they were putting the intake back on they had a 2 foot ratchet on the vibration dampener bolt, to bar the engine over and touched the alternator pulley and it sparked on them. I still have no clue. As far as the spider valve I plugged the none working injectors into other plugs and still no joy.
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Hammer Time
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Aug 6, 2009, 5:44 AM
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Re: 1996 4.3L 1500 chevy problem
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If you have a noid light, you can check for the signal on each wire going in so you can determine if each injector is getting both pulse and power. Also check your fuel pressure. These poppet injectors are very pressure sensitive. You can't go below 60 PSI. Most won't even run at 55.
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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.
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johnstudstill
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Aug 6, 2009, 5:56 AM
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Re: 1996 4.3L 1500 chevy problem
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What about the spark? Whats causing that problem?
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Hammer Time
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Aug 6, 2009, 6:02 AM
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Re: 1996 4.3L 1500 chevy problem
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What problem? You said the spark was fine.
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johnstudstill
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Aug 6, 2009, 6:19 AM
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Re: 1996 4.3L 1500 chevy problem
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No its missing fire on 2 cyliders
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Hammer Time
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Aug 6, 2009, 6:27 AM
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Re: 1996 4.3L 1500 chevy problem
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You've got me totally confused now.
If your missing spark on 2 cylinders it can only be the cap, wires or the distributor is not set correctly. You cannot adjust the timing on that engine and the distributor has to be synched with a tech2 scan tool. That should be setting a P1345 code if that were the problem though.
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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.
(This post was edited by Hammer Time on Aug 6, 2009, 6:27 AM)
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Loren Champlain Sr
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Aug 6, 2009, 12:21 PM
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Re: 1996 4.3L 1500 chevy problem
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john; Which two cylinders? Have you double and triple checked the firing order? Really easy to get a couple wires crossed.
Loren
SW Washington
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johnstudstill
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Aug 6, 2009, 12:25 PM
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Re: 1996 4.3L 1500 chevy problem
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I want to say 3 and 4. I have checked multiple times. I just need it fixed
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Loren Champlain Sr
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Aug 6, 2009, 12:38 PM
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Re: 1996 4.3L 1500 chevy problem
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<<I want to say 3 and 4<< You are allowed to say anything you like. But, we need to know for sure, which two cylinders. The firing order is 1-6-5-4-3-2. Note that 4 & 3 are next to each other in the firing order. If those two are crossed.....?
Loren
SW Washington
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johnstudstill
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Aug 6, 2009, 12:39 PM
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Re: 1996 4.3L 1500 chevy problem
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Even if the firing order is crossed, still should show spark right?
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Sidom
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Aug 6, 2009, 12:40 PM
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Re: 1996 4.3L 1500 chevy problem
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I would start from scratch on this one. Pull the #1 plug bring it up on compression, line the mark up the balancer & make sure the dist is in correctly. On a lot of those they have a white mark on the manifold & dist from the factory to help line it up, as HT said, you even get it a few degrees off & you'll set a code.....
My only other question....... Why the h*ll were they turnning the engine over with breaker bar to do an intake gasket??????????
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Loren Champlain Sr
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Aug 6, 2009, 12:46 PM
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Re: 1996 4.3L 1500 chevy problem
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Yes, you'd still get spark, just at the wrong time.
Loren
SW Washington
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johnstudstill
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Aug 6, 2009, 12:49 PM
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Re: 1996 4.3L 1500 chevy problem
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I wasn't a part of that evolution. So I don't know about that one. I will start from scratch again.
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johnstudstill
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Aug 6, 2009, 12:50 PM
Post #16 of 23
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Re: 1996 4.3L 1500 chevy problem
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Still doesn't explain the loss of spark. I am goin to get a new spider valve
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Loren Champlain Sr
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Aug 6, 2009, 12:53 PM
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Re: 1996 4.3L 1500 chevy problem
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john; It's rare, but it is possible, that you've got a defective distributor cap....We need to determine, for sure, which two cylinders aren't getting spark. Remove the cap and inspect it carefully. Look for a carbon track between two cylinders. If you've got a spark plug wire or wires that have too much resistance, the spark is going to go to the least path of resistance.
Loren
SW Washington
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Hammer Time
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Aug 6, 2009, 12:55 PM
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Re: 1996 4.3L 1500 chevy problem
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What's a spider got to do with spark. This is why we get confused. Are you chasing a spark problem or a fuel problem?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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Sidom
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Aug 6, 2009, 12:55 PM
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Re: 1996 4.3L 1500 chevy problem
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If you want to jump ahead, thats cool. But how is a new injector going to cure you're spark problem......
If you are getting spark out of the coil & for sure you have no spark on those to cylinders. It would have to be in the dist area and those caps are very bad for internal crossfire and because of their design you can't see it with the naked eye..... I've even see brand new aftermarket caps crossfire.... On those I go OE if at all possible.........
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Loren Champlain Sr
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Aug 6, 2009, 12:57 PM
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Re: 1996 4.3L 1500 chevy problem
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Great minds think alike.
Loren
SW Washington
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johnstudstill
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Aug 6, 2009, 1:01 PM
Post #21 of 23
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Re: 1996 4.3L 1500 chevy problem
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I appreciate all the input. I am goin to test all of this input this weekend.
I tested the spider valve just because I was pi**ed. I know it has nothing to do with the spark.
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Loren Champlain Sr
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Aug 6, 2009, 1:10 PM
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Re: 1996 4.3L 1500 chevy problem
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john; I know just how frustrating this can be. Please let us know what it turns out to be. For us, and others, that may be experiencing similar issues. Have a great weekend. And, don't let it 'get to you'. You'll get to the bottom of it!
Loren
SW Washington
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johnstudstill
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Aug 6, 2009, 2:24 PM
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Re: 1996 4.3L 1500 chevy problem
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I will post results. I do plan on tackling this nightmare this weekend, if I get results, i will post them. Thanks again.
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