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Old 02-08-2011, 01:54 PM   #1
scotts62
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Lightbulb 88-98 FAQ's "Is your truck running weird? Check here it could help"

Post your threads here for the new 88-98 FAQ post which will be a separate sticky when complete.

Please make sure that the pics are uploaded to this sites gallery when used here to ensure the URLs are still there later for when we are looking through this thread for help, Thanks.
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Old 02-08-2011, 05:14 PM   #2
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Re: 88-98 FAQ's

Ill add more when i find some good ones to help

High idle problems

http://67-72chevytrucks.com/vboard/s...d.php?t=439984

EGR identification (thanks Chevytech)

http://shbox.com/1/EGR_ID.jpg
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Last edited by scotts62; 02-09-2011 at 10:50 AM.
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Old 02-09-2011, 11:21 AM   #3
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Re: 88-98 FAQ's

Scott – dig through these and see which ones you want.
I will work on this more later.

Running Rich, or acts like no choke = Coolant sensor testing:
http://67-72chevytrucks.com/vboard/s...d.php?t=322811

http://67-72chevytrucks.com/vboard/s...d.php?t=379142

***************************************

Tighten up Tilt column links;

On C/K trucks in 1995 they went to a “new” style column.

If your truck is a 1994 or older the following information should help.

Here are some steering column sites with photos that tell how to repair loose tilt columns. The photos should be helpful.

http://www.fieros.de/en/articles/steering.html

http://elcaminocentral.com/article95.html

Looks like on this site he did the quick fix and did not take it apart far enough to tighten all four fasteners.
http://www.chevyasylum.com/column/tiltcol.html

Exploded View of a tilt column.
http://www.nastyz28.com/tech/e-tiltcol.html

Older car but good photos
http://buickperformance.com/tiltstee...lumnwobble.htm


***********************************

Tilt column lock plate removal;
http://67-72chevytrucks.com/vboard/s...ht=tilt+column

*****************
Fuel pressure testing – split hose in tank:
http://67-72chevytrucks.com/vboard/s...d.php?t=375132

**************************
Set timing wire connector for 1988- 1993 C/K pickup trucks illustration:
http://67-72chevytrucks.com/vboard/a...1&d=1251120221
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.

Last edited by scotts62; 02-09-2011 at 11:37 AM.
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Old 02-09-2011, 01:04 PM   #4
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Re: 88-98 FAQ's

This is gonna be a great help to those who seek help, without asking "where, who, etc.," before doing a search for the help they need. There's a lot of information on here that people can access, if they will just take the time to utilize the already available resources.
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Old 02-09-2011, 01:54 PM   #5
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Re: 88-98 FAQ's

How-To: 88-91 speedometer calibration 25085515 91' tach upgrade


Vortec SBC How To replace intake gaskets, set ignition timing, replace spider injectors...

Wiring Diagrams.....


wiring diagrams for 88 chevy

wiring diagrams for 89 chevy

wiring diagrams for 90 chevy

wiring diagrams for 91 chevy

wiring diagrams for 92 chevy

wiring diagrams for 93 chevy

Last edited by tommie; 05-23-2011 at 03:40 PM.
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Old 02-09-2011, 02:37 PM   #6
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Re: 88-98 FAQ's

Cleaning evap core for better a/c function

Edit: Also wanted to say that an 88-98 FAQ section is a terrific idea -- it seems like every day there's somebody with EGR/IAC/ECTsensor problems. The FAQ section should be subtitled "Is your truck running weird? Check here first!"
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Old 02-09-2011, 07:08 PM   #7
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Re: 88-98 FAQ's

1991 & later TBI V8 Oil pressure sending unit location, engine wiring & sensors illustration:
Also shows ground on back of passenger cylinder head.
http://autorepair.about.com/library/...bl283a-lib.htm

TBI V8 Knock sensor location photo
from “PCMCOBRA”, from one of the truck boards.
http://i114.photobucket.com/albums/n...010Small-1.jpg

Dash Brake indicator on or blinking = RWAL problems
Here are two of the better threads
http://67-72chevytrucks.com/vboard/s...d.php?t=302690
http://67-72chevytrucks.com/vboard/s...d.php?t=399153

TBI parts & sensor photos
EGR (Exhaust Gas Recirculation) valve
EGR solenoid
IAC (Idle Air Control)
MAP (Manifold Absolute Pressure) sensor
TPS (Throttle Position Sensor)
All labeled in photo of 1993 Silverado:
http://67-72chevytrucks.com/vboard/a...1&d=1278787232
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.

Last edited by ChevyTech; 02-11-2011 at 02:34 PM. Reason: Add more
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Old 02-09-2011, 08:58 PM   #8
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Re: 88-98 FAQ's

HOW TO: Manual locks and windows to power conversion

http://67-72chevytrucks.com/vboard/s...d.php?t=445732
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Old 02-10-2011, 09:39 PM   #9
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Re: 88-98 FAQ's

Bucket seat options for 88-98's

http://67-72chevytrucks.com/vboard/s...38#post4476938
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Old 05-08-2011, 07:51 PM   #10
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

po420 and po430 codes
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Old 05-09-2011, 08:28 PM   #11
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

From TBI to Vortech
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Old 06-23-2011, 09:31 PM   #12
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

Quote:
Originally Posted by scotts62 View Post
Post your threads here for the new 88-98 FAQ post which will be a separate sticky when complete.

Please make sure that the pics are uploaded to this sites gallery when used here to ensure the URLs are still there later for when we are looking through this thread for help, Thanks.
I am new on THIS forum...... Trying to search 'stickies' to find a replacement windshield wiper DELAY MODULE. ( I can only find the motor at auto parts places.) In SoCal.

FAQ seems limited (I think)

1988 GMC Sierra SLE 2500

( Is this where I am supposed to post my inquiry?) Thanks
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Old 06-24-2011, 06:26 PM   #13
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

Quote:
Originally Posted by mountie View Post
I am new on THIS forum...... Trying to search 'stickies' to find a replacement windshield wiper DELAY MODULE. ( I can only find the motor at auto parts places.) In SoCal.

FAQ seems limited (I think)

1988 GMC Sierra SLE 2500

( Is this where I am supposed to post my inquiry?) Thanks
Limited to only what people post in here to help out.

A parts store would be the best place to find one i would think..

This part of the forum is just for posting FAQ's
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Old 06-24-2011, 06:35 PM   #14
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

Quote:
Originally Posted by scotts62 View Post
Limited to only what people post in here to help out.

A parts store would be the best place to find one i would think..

This part of the forum is just for posting FAQ's
Amazon or Evilbay both have them. I bought one recently on Ebay for about $24 and free shipping. Just search for your year's wiper delay module. Should be a bunch out there. Sorry add Pulse to the search or it pulls up old stuff. Its really a pulse delay module, real easy to replace.
Link http://cgi.ebay.com/New-Part-WIPER-P...item3a66661054
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Old 08-02-2011, 10:18 PM   #15
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

I didn't see this one posted about weird running, I thought I'd share what I learned from Chevytech:

If your TBI engine is acting like a bad fuel pump, or bad filter, almost stalling and then recovering, like it's almost running out of gas... check the little rubber hose in the gas tank, between the fuel pump and the steel fuel line, down in the tank. If it looks old at all, replace it. If it gets a pinhole it can make the truck act strange due to low fuel pressure.
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Old 11-06-2011, 10:55 AM   #16
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

A/C Problems and Solutions... Tahoe Edition
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Old 11-06-2011, 01:38 PM   #17
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

Quote:
Originally Posted by red71cheyenne View Post
Amazon or Evilbay both have them. I bought one recently on Ebay for about $24 and free shipping. Just search for your year's wiper delay module. Should be a bunch out there. Sorry add Pulse to the search or it pulls up old stuff. Its really a pulse delay module, real easy to replace.
Link http://cgi.ebay.com/New-Part-WIPER-P...item3a66661054
The wiper delay-pulse module and the motor they show doesn't look anything like my '88 GMC C2500......

WHO has the correct one? They claim it is for an '88, but they are wrong.
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Old 11-07-2011, 06:35 PM   #18
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

Quote:
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What year models???? If inside the tank????
My truck is a 1989, and this happened to it. I'd assume all the TBI trucks are set up very similar, so that would be from 1987-1994 if I remember right. It's inside the tank. It connects the fuel pump to the metal fuel line that goes to the engine, so you have to remove the tank (or remove the bed, that's what I did) and remove the fuel pump/sending unit module.
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Old 11-07-2011, 10:29 PM   #19
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

Post here for links of helpful info to share with others, if this thread does not answer your question about your truck please post it in the forums, thanks.
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Old 01-18-2012, 11:33 AM   #20
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

1993 DRAC wiring

http://67-72chevytrucks.com/vboard/s...d.php?t=503507
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Old 01-19-2012, 09:53 AM   #21
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If you remove the distributor from a First Gen. Vortec engine

If you remove and replace the distributor in a generation I Vortec engine, it's correct position must be checked by scanning the cam retard number. According to GM it's referred to as the Camshaft Retard Offset Adjustment.

Here is the shop manual page for it.

http://carphotos3.cardomain.com/imag...arge.jpg?modal

The timing of a Vortec is not adjustable but the position of the distributor must be at a reference point of 0 degrees +- 2. This will have an effect on idle quality and fuel economy at least.

We know without doubt that a Snap-on Solus, Solus-Pro and Modis will show the cam retard value. Others may, but I'm not aware of them.

Just to let you know, mine was reinstalled without checking the cam retard going back as far as 2005. I was careful to reinstall it each of 3 times doing the intake gaskets. It never gave a code after the install. The last time a week ago after a complete rebuild, it was at -13*. Never had a code.

Now here's one thing you won't read in any shop manual.

Once I got it to 0, in no time it threw a code 1345. Let me repeat that. I was off for over 6 years and never threw a code. After I set it to 0, it threw a code.

My recommendation comes from others that have experienced the same thing. Set it slightly negative. The spec is +-2 away from 0.

Again I want to repeat for people using "google" looking for this information. If you remove and replace the distributor in a generation I Vortec engine, it must be checked by scanning the cam retard number.
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Old 01-19-2012, 10:08 AM   #22
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

Uh, and what years is a Generation 1 Vortec??
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Old 01-19-2012, 10:13 AM   #23
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

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Uh, and what years is a Generation 1 Vortec??
Vortec SBC 1996- 1998 in the trucks, went to 1999 in the suv (suburban)

IIRC
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Old 01-24-2012, 07:16 AM   #24
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

Actually the L31 was used in the following

1996–2003 Chevrolet Express/GMC Savana full-size vans
1996–1999 Chevrolet/GMC C/K full-size trucks
1996–1999 Chevrolet Suburban/GMC Suburban full-size long-wheelbase SUVs
1996–2000 Chevrolet Tahoe/GMC Yukon full-size short-wheelbase SUVs
1999–2000 Cadillac Escalade

The basic block is still in limited production as a crate engine as several versions including the ramjet 350.
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Old 02-04-2012, 09:20 PM   #25
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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

Dash removal vid and how to.

http://67-72chevytrucks.com/vboard/s...d.php?t=507207
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