Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN







Chevy Base timing disconnect wire


  Email This Post



mr+brakes
User

Dec 25, 2012, 11:57 AM

Post #1 of 18 (3009 views)
Shortcut
Chevy Base timing disconnect wire Sign In

I need to find the wire to disconnect to set base timing on a 2000 chevy K3500 with a 5.7.

On earlier models of chevy there is one brown wire that gets separated to set to base timing without computer taking control. Does the 2000 chevy K3500 have the same aspects to set base timing?
If so where is the wire located in the 2000 chevy K3500 to disconnect to set the base timing?

Help! Does anyone have location to this wire needed to disconnect to set the base timing on a 2000 K3500 5.7?

On engines after 1980 GM required a base timing set before computer is set to control engine.


(This post was edited by mr+brakes on Dec 25, 2012, 11:58 AM)


Hammer Time
Ultimate Carjunky / Moderator


Dec 25, 2012, 12:02 PM

Post #2 of 18 (2996 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

You cannot adjust the timing in that engine.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Tom Greenleaf
Ultimate Carjunky / Moderator


Dec 25, 2012, 12:16 PM

Post #3 of 18 (2973 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

Not sure how much anyone will be around today but found this and could be wrong. Timing is not adjustable as HT said but putting distributor back in if out is an issue.

This is what I found with no assurance of accuracy.................

4.3L, 5.0L, 5.7L And 7.4L Engines
Timing Disturbed

  1. Remove the No. 1 cylinder spark plug. Turn the engine using a socket wrench on the large bolt on the front of the crankshaft pulley. Place a finger near the No. 1 spark plug hole and turn the crankshaft until the piston reaches Top Dead Center (TDC). As the engine approaches TDC, you will feel air being expelled through the No. 1 cylinder spark plug hole. The timing mark on the crankshaft pulley should now be aligned with the 0 mark on the timing scale. If the position is not being met, turn the engine another full turn (360 degrees). Once the engines position is correct, install the spark plug.
    NOTE Before installation, position the rotor so it points to the No. 2 terminal on the cap. As the distributor is lowered into the engine, the rotor will rotate clockwise and stop at the No. 1 terminal. This is the desired position.
  2. Turn the rotor so that it will point to the No. 1 terminal of the distributor cap when it is fully seated in the engine.
  3. Install or connect the following:
    NOTE If the distributor will not seat completely in the engine, remove the distributor and align the groove on the top of the oil pump drive shaft with a long screwdriver to match the tab on the bottom of the distributor shaft. Reinstall the distributor.


    Distributor. It may be necessary to turn the rotor a little in either direction, in order to engage the gears.
  4. Tap the starter a few times to ensure that the oil pump shaft is mated to the distributor shaft.
  5. Bring the engine to TDC again and check that the rotor is pointed toward the No. 1 terminal of the cap. If the marks are all aligned.
  6. Install or connect the following:

    Hold-down bolt and tighten Cap and fasten the mounting screws Electrical connections and the spark plug wires

T


Hammer Time
Ultimate Carjunky / Moderator


Dec 25, 2012, 12:22 PM

Post #4 of 18 (2964 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

If you move this distributor in any way, you are going to need a very expensive scan tool to get it set again or it will run terrible and set a P1345 code. There is no reason to ever touch this distributor unless it is being removed for some reason.

The procedure Tom gave is only to get it close enough to start. The scan tool will be required to set it correctly.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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 Dec 25, 2012, 12:23 PM)


mr+brakes
User

Dec 25, 2012, 10:46 PM

Post #5 of 18 (2918 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

Distributor had been removed, so in this case your saying timing is done with a scan tool? I know that on earlier models that the base timing was set by disconnection of one wire that engaged computer and a timing light was used to set base timing at zero.

So when did the timing light become obsolete timing the 5.7 engine?


Tom Greenleaf
Ultimate Carjunky / Moderator


Dec 25, 2012, 10:56 PM

Post #6 of 18 (2915 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

Timing light! Pretty sure for GM about when HEI ignitions ended. Could still use it to see if a plug wire has spark going thru it. What prompted you to touch the distributor to begin with? - T


Sidom
Veteran / Moderator


Dec 25, 2012, 11:14 PM

Post #7 of 18 (2911 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

Almost 20 years ago.....

Not sure where the mark came from but I've noticed a white mark on the dist base & manifold on a lot of them. If you line the 2 up after the dist has been installed corrected you may get lucky......If it has a mark, you'll need a mirror to line it up

If you get it to far out, you'll turn a light on & set a code as HT has indicated






__________________________________________________________________________________________



Hammer Time
Ultimate Carjunky / Moderator


Dec 26, 2012, 6:36 AM

Post #8 of 18 (2896 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In


Quote
Distributor had been removed, so in this case your saying timing is done with a scan tool?


No, I didn't say that. I said the ignition timing wasn't adjustable at all. Turning the distributor changes the cam sensor synch and synchronizes the primary ignition with the secondary ignition and it can only be done with a high end scan tool.

Timing lights became obsolete on most everything made since late 90s.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



mr+brakes
User

Dec 26, 2012, 7:55 AM

Post #9 of 18 (2890 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

Timing has to be adjustable in order to set the base timing, otherwise the computer has no way to be accurate control of timing.


I have other GM trucks the timing is set by disconnection of one wire to set base timing, A 2000 chevy does not have coil pack, where timing is not an issue when a coil pack is used.


Hammer Time
Ultimate Carjunky / Moderator


Dec 26, 2012, 7:59 AM

Post #10 of 18 (2886 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

You know, I really have no patience for people that ask for help from professionals and then want to debate the information. I'm telling you that the ignition timing IS NOT ADJUSTABLE. If you want to debate that, I don't have time for you nonsense.
I'm going to say this one time, Any vehicle that uses a crank sensor has no means to change the base timing.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



mr+brakes
User

Dec 26, 2012, 8:35 AM

Post #11 of 18 (2881 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

Gm still had base timing adjustable except when a coil pack is used. I personally found that base timing is adjustable by disconnection of one wire, which is usually brown to disengage computer to set the base timing.

Not in all vehicles is in the same location is this wire found. I had even done timing on vans where it has the same wire to disconnect to set the base timing not using a coil pack.

I've retired due to my age and forgotten allot but still know base timing is very important in order for the computer to function properly.

I may not be able to keep up with everything since I'm retired but I know GM did not eliminate the need to set the base timing on engines without coil pack.


mr+brakes
User

Dec 26, 2012, 8:48 AM

Post #12 of 18 (2879 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

 
Hammer Time

You seem to get cranky, however I guess that is with your territory. I admit that I may behind in times, but I'm not a young any more and things change over the years.

Have a nice day.

In Reply To


nickwarner
Veteran / Moderator


Dec 26, 2012, 8:49 AM

Post #13 of 18 (2879 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

You're still thinking about this like the distributors you used to work on. This is nothing whatsoever like it. From the outside it looks like one. If you don't get this installed back to EXACTLY where it was when you pulled it you WILL have a code, it WILL run like crap and you CANNOT do a single thing to help that with a timing light at all. HT has explained that to you several times. You have to have a high-end scan tool to fix this and the knowledge to use it if you get this wrong. Ignore the advice at your own peril, maybe it'll run enough to get to a shop and pay someone to undo this. Or its going there on a wrecker. All of us here have made plenty of money with our scan tools because of someone who was convinced that this wasn't true and they could adjust it themselves with a timing light. When they tried to do it and failed it ends up in our bays and gets done right.

Things have changed on cars. We did away with bias-ply tires. We invented ABS. Radios play music from satellites. And your timing isn't adjustable in any way shape or form.

Its your truck, do what you want with it at your own peril.


Hammer Time
Ultimate Carjunky / Moderator


Dec 26, 2012, 8:56 AM

Post #14 of 18 (2875 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In


Quote
I admit that I may behind in times, but I'm not a young any more and things change over the years.


No Sh!t! That's a good reason to listen and stop arguing with the people that you asked for help.

I don't mind helping people that actually take the help, in fact I spend a good deal of timing doing it but I'll be damned if I'm going to spend all my time convincing people that want to argue with me.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Discretesignals
Veteran / Moderator


Dec 26, 2012, 9:09 AM

Post #15 of 18 (2870 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

Base ignition timing isn't adjustable on that set up because the crank sensor is fixed on the front of the engine. The engine computer gets base ignition timing from the crank sensor and not the distributor cam sensor.

As HT stated the computer uses the cam sensor in the distributor to figure out when number one is top dead center on the compression stroke, so it can synchronize fuel injection. When you turn the distributor, your changing the cam sensor signal timing in relation to the crank sensor signal timing. Another words instead of changing base ignition timing by rotating the distributor your changing injection timing.

That explains why when you disconnect the crank sensor on that engine it won't start, because the computer doesn't know when to start the firing sequence.

If you don't believe us, connect your timing light to number one and point it down on the balancer while turning the distributor. You'll understand.

Just because it has a distributor doesn't always mean the base timing is adjustable. Dodge &Jeep have distributors on their engines (318,360,4.0L early) but the crank sensor is down by the flywheel, so base ignition timing isn't adjustable on them either.

On older HEI systems, the ignition module got the crank position from the sensor in the distributor. The ignition module controlled base ignition timing, but the engine computer was able to modify the base ignition timing through an EST circuit after the engine got running. Disconnecting the EST circuit (tan/black wire) caused the ignition module to revert back to base ignition timing mode, so you could adjust the base ignition timing by rotating the distributor.

(This post was edited by Discretesignals on Dec 26, 2012, 9:56 AM)


mr+brakes
User

Dec 26, 2012, 11:50 PM

Post #16 of 18 (2819 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

Problem solved with wiring. Issue found in the wiring.

Have A Nice Day


Hammer Time
Ultimate Carjunky / Moderator


Dec 27, 2012, 6:07 AM

Post #17 of 18 (2813 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

Yep, plug wires in the wrong order won't run too good.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Discretesignals
Veteran / Moderator


Dec 27, 2012, 10:43 AM

Post #18 of 18 (2804 views)
Shortcut
Re: Chevy Base timing disconnect wire [In reply to] Sign In

What was the issue with the wiring? If it was plug wires being switched, that is a common mistake.

It's funny we were never told any symptoms. You should still have the offset checked with a scan tool. If the cam sync is off, it can cause engine damage. Just some FYI.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.




Chevy Base timing disconnect wire


  Email This Post
 
 






Latest Forum Post
2009 RAV-4 Sport, V6, 135,000+ km. Within the last 2 weeks there has been inter...
I've got my car up on jack stands to do a tranny fluid and filter change but it ...
Hi All, I am based out of India and I own a 4 year old Hyundai I20 1.2 litre ...
I installed a set of new headlights on my 05 Pontiac Grand AM, these are the hea...
I may have asked this awhile back . I want to buy a power probe . I work with sc...
I just bought a 2010 Chevrolet Impala and in my first day of ownership it rained...

Feed Button


Used Car Search
Used Car Price Ranges:
Under $5,000
$20,000
$35,000

$10,000
$25,000
$40,000
$15,000
$30,000
$45,000
Over $45,000
Search used Cars By Manufacturers:
Used Acura
Used Audi
Used BMW
Used Buick
Used Cadillac
Used Chevrolet
Used Chrysler
Used Dodge
Used FIAT
Used Ford
Used GMC

Used Honda
Used Hyundai
Used Infiniti
Used Jaguar
Used Jeep
Used Kia
Used Land Rover
Used Lexus
Used Lincoln
Used Mazda
Used Mercedes-Benz

Used MINI
Used Mitsubishi
Used Nissan
Used Porsche
Used Saab
Used Scion
Used Subaru
Used Suzuki
Used Toyota
Used Volkswagon
Used Volvo
2010 Honda Civic
$15,770
2004 Jeep
$8,991
2012 Mustang
$22,990
1997 Honda Cr-V
$4,490
2010 Toyota Prius
$17,496
2010 BMW 328
$26,980




Automotive Forum Categories
Automotive Repair
Auto Body Repair and Refinishing
AC Auto Repair Help Forum
Automotive Wiring and Electrical

Auto Insurance and Car Financing
Automotive World
Brake Systems
Car Stereo Repair Advice
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair

Steering and Suspension
Tricks of the Trade
General Discussions
Car Shows and Events
The Bargin Bin
Motor Vehicle Inspection
Car Care Tips
Traffic Ticket Help
Car Racing

Gasoline, Motor Oils, Concept Cars
Remote Control Cars and Vehicles
Truck Repair
Truck Repair Advice


Truck Engine Repair
Truck Suspension Repair
Motorcycle Repair
Motorcycle and ATV Repairs

Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Seat Repair
Car Forum Posts - Sitemap


Search for (options) Privacy