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Forum: 1st Generation S-series (1983-1994) Tech

01-20-2011, 03:40 PM

Replies: 10

How much timing advance do YOU use, 4.3 TBI & CPI How much timing advance do YOU use

Views: 49,303

Posted By Doctorvette

This does not relate to the 94 CPI. When the...

This does not relate to the 94 CPI.
When the timing was moved from a -3deg to 0deg the O2 & Fuel Rich code went away.

This DOES relate to my 96 Yukon which does NOT have initial timing set and no...

Forum: 1st Generation S-series (1983-1994) Tech

01-16-2011, 07:57 PM

Replies: 10

How much timing advance do YOU use, 4.3 TBI & CPI How much timing advance do YOU use

Views: 49,303

Posted By Doctorvette

A note of importance here. Originally this...

A note of importance here.

Originally this 94 CPI vehicle had a -3 degrees timing, I kept getting O2 sensor & Fuel Rich Codes.

Setting the timing on factory spec 0 Degrees stopped the Check...

Forum: 1st Generation S-series (1983-1994) Tech

01-12-2011, 11:45 AM

Replies: 10

How much timing advance do YOU use, 4.3 TBI & CPI How much timing advance do YOU use

Views: 49,303

Posted By Doctorvette

On vehicles with the same system as my 96 Yukon...

On vehicles with the same system as my 96 Yukon w/5.7L Vortec, you are absolutely correct.

AFAIK, on these units with a "timing scale" which allows for initial timing set, I am pretty sure the...

Forum: 2nd Generation S-series (1995-2005) Tech

01-10-2011, 07:22 PM

Replies: 13

EGR Insufficient Flow & Running too Rich

Views: 25,400

Posted By Doctorvette

I realize this is an old thread, however I ran...

I realize this is an old thread, however I ran across a 4.3 same year as yours with "fuel rich" and O2 codes and it turned out to be low timing.

The EST wire is under the passenger floor mat high...

Forum: 1st Generation S-series (1983-1994) Tech

01-10-2011, 07:05 PM

Replies: 10

How much timing advance do YOU use, 4.3 TBI & CPI How much timing advance do YOU use

Views: 49,303

Posted By Doctorvette

How much timing advance do YOU use, 4.3 TBI & CPI How much timing advance do YOU use

How much timing advance do YOU use, 4.3 TBI & CPI

I'm an old wrench, we used to put the timing off the scale back in the old days, with massive...

Forum: 2nd Generation S-series (1995-2005) Tech

08-03-2010, 12:40 PM

Replies: 13

EGR Insufficient Flow & Running too Rich

Views: 25,400

Posted By Doctorvette

Thanks swartlkk...

Thanks swartlkk (https://blazerforum.com/forum/member.php?u=577) for that important note.

On your AC/heater problems, I too have similar problems. A visit to a mechanic pal yesterday led me here....

Forum: 2nd Generation S-series (1995-2005) Tech

08-02-2010, 10:44 PM

Replies: 13

EGR Insufficient Flow & Running too Rich

Views: 25,400

Posted By Doctorvette

Ask em at Autozone which system you have, just...

Ask em at Autozone which system you have, just for info, OBD-I or OBD-II

How many miles on this vehicle ?

I may be wrong about the EGR thing, the ECM may see limited EGR flow and increase...

Forum: Full Size K5 (1969-1991) GMT415 (1992-1994) Tech

07-29-2010, 12:13 PM

Replies: 2

96 Yukon 4x4 Hot Start & Idle Prob

Views: 866

Posted By Doctorvette

I'll give those ideas a shot. I don't...

I'll give those ideas a shot.

I don't believe in the tooth fairy anymore or in New Plug Wires;

clarification, per GM's service manual, plug wire resistance should be between
12,000-15,000 ohms...

Forum: 2nd Generation S-series (1995-2005) Tech

07-28-2010, 01:42 PM

Replies: 13

EGR Insufficient Flow & Running too Rich

Views: 25,400

Posted By Doctorvette

Where did you get the " EGR insufficient Flow "...

Where did you get the " EGR insufficient Flow " ?? These words and "Rich Running" don't go together.
96 and up are OBD -II which may give this code
95 and earlier models are OBD-I
Like many mfgs,...

Forum: Full Size K5 (1969-1991) GMT415 (1992-1994) Tech

07-28-2010, 12:39 PM

Replies: 2

96 Yukon 4x4 Hot Start & Idle Prob

Views: 866

Posted By Doctorvette

96 Yukon 4x4 Hot Start & Idle Prob

Do you guys consider a Yukon 4x4 in the same line as the Blazer ?
Hope so.

Anyway,, it's a 350 Vortec 220,000 miles that runs great.

Hot start after sitting 15~ minutes requires a bit of...

Forum: Full Size K5 (1969-1991) GMT415 (1992-1994) Tech

07-28-2010, 12:12 PM

Replies: 3

700r4 question

Views: 1,717

Posted By Doctorvette

After you pull the pan, and IF you do find lots...

After you pull the pan, and IF you do find lots of debris, know this.
Pulling the tranny yourself will save you half or more in getting it built by the shop.
Copper flakes in the pan indicate a...

Forum: 1st Generation S-series (1983-1994) Tech

07-28-2010, 11:54 AM

Replies: 19

94 s10 driving issues

Views: 5,615

Posted By Doctorvette

Have you pulled the flex hose off the throttle...

Have you pulled the flex hose off the throttle body and put in a few tablespoons of fuel to see if your problem is fuel ?
2 non-lit propane torches will provide about enough fuel to partially run it...

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