1993 S-10 Blazer 4.3 lt. 2WD

Tiny
DAVIDBUICE
  • MEMBER
  • 1993 CHEVROLET TRAILBLAZER
? I have replaced all of the sensors, new timing chain, new plugs, wires, dist. Cap, rotor, 160,000 mi;
It is ideling rough, sometimes cranks fast, sometimes cranks slow, while driving cold, it runs great! Once it warms up, it boggs down between 1st and 2nd gear. Sometimes it will "catch up" to itself and then begin running fine until the next time I have to stop.

Would having it hooked up to a diagnostic computer tell me what's wrong?
Does it sound like something simple that I can fix?
Do you
have the same problem?
Yes
No
Sunday, December 17th, 2006 AT 5:59 PM

4 Replies

Tiny
KENVCR
  • MEMBER
OK, you have done a lot of work and spent a lot of money. Did you have this problem before you started?
4.3 litre, model 220 TBI fuel injection. 700R4 tranny.
The most neglected (or not thought of parts) are the TBI parts themselves. Do you get the odd smeel of raw gas?
What I know you need by what you described is a new Fuel pressure regulator.
You buy it already attached to the "fuel meter cover".
It is a simple exchange of parts.
ALWAYS remember to un hook your battery whenever you are working with the fuel system. You have to undo the injector wires, may cause a spark and poof in your face because you will be working very close to it.
This will also give your computor a chance to reset after you exchanged all those other parts.
Good luck,
Let us know what happens.
Kenvcr.

PS where you getting really crappy gas mileage?

No you don't have to have it scoped and yes it is very simple to do.
You need a # 15 torx screwdriver and locktite for those screws on reassembly.
Was this
answer
helpful?
Yes
No
Sunday, December 17th, 2006 AT 11:02 PM
Tiny
DAVIDBUICE
  • MEMBER
I am sorry,
It is CPI, and yes --lousy gas mileage, and no, it was not bogging down between 1st and 2nd before I replaced the timing chain. Seems like as soon as it warms up, it starts running bad.
Was this
answer
helpful?
Yes
No
Monday, December 18th, 2006 AT 1:34 AM
Tiny
DAVIDBUICE
  • MEMBER
Would I get a code for a faulty fuel pressure regulator?
Yes there is raw gas fumes.
Is there anything else I need to know about replacing this fuel pressure regulator?

Thanks. David
Was this
answer
helpful?
Yes
No
Monday, December 18th, 2006 AT 11:51 AM
Tiny
KENVCR
  • MEMBER
A CPI fuel injection system is different from TBI, but you should find your regulator attached to the CPI unit, around the mid body of the manifold, under the air plenum.
You will not get a fault code.
I am not sure if the regulator on this model can be replaced or if you have to replace the entire unit.
Call your part stores and then call a GM dealership parts dept.
Ken vcr
Was this
answer
helpful?
Yes
No
Monday, December 18th, 2006 AT 12:49 PM

Please login or register to post a reply.

Recommended Guides