MY 5.7L is having issues.

Asked by Jul 04, 2015 at 10:23 AM about the 1988 Chevrolet Suburban V10 4WD

Question type: Maintenance & Repair

My 1988 Suburban with the 5.7L starts and runs good but after it's been driving for a
few miles it starts to cut out like it's not getting enough fuel, but if I step on it it
downshifts and runs fine until I let off then it starts cutting out again.  When I come to
a stop it idles just fine but has a bit of a problem taking off.  If it sits for a while it runs
perfectly for the first few miles then starts to act up again.  I have no idea where to
start looking, please help.

8 Answers

86,815

First check for memory codes, if that is a dead end then check fuel pressure and flow, could be a faulty pressure regulator, check for vacuum leaks, intake gaskets are known failures on this engine. When did you have the injectors cleaned? Clean injectors are critical on this spyder injection system. HTH

I just put new injectors in it. How do I check for vacuum and intake leaks, and for memory codes.

86,815

Intake leaks can be checked by blocking off the PCV valve and PCV fresh air intake ports then starting the engine and check too see if the crankcase develops a vacuum, if it does then there is an intake leak. A scan tool is the best way to check for memory codes on the old OBD 1 system, but if your watchful enough you can do it with a paper clip and use the flash out method.

Thank you, I'll try that out.

40,245

Did it run properly after you put the new injectors in? What was the reason for new injectors?

Best Answer

It was running fine. I put new injectors, distributor cap, coil, plugs, plug wires, and 1 inch riser. I just found a vacuum line that goes to the throttle body that has a crack in it. could that be the problem? I'll replace it, just waiting on the parts store to open.

86,815

Unmetered vacuum leak will cause a lean condition that the ECM cannot over come so it can cause a running problem, if it is your problem it is hard to say.

It's not the vacuum line. The store I was at didn't have the PCV valve but there is one in the next town over. I was going there today anyways so I'll pick it up and try it out tomorrow.

Your Answer

Add photo

Related Questions

Suburban

Looking for a Used Suburban in your area?

CarGurus has 18,771 nationwide Suburban listings starting at $1,399.

ZIP:

Search Chevrolet Suburban Questions

Chevrolet Suburban Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 930
#2 Eric Fritz
Eric Fritz
Reputation 860
#3 mariroger
mariroger
Reputation 800
View All

Related Models For Sale

Used Ford F-150
2,693 Great Deals out of 211,512 listings starting at $1,000
Used GMC Suburban
177 listings starting at $1,495

Used Cars For Sale

2017 Chevrolet Suburban For Sale
4,278 listings starting at $38,592
2016 Chevrolet Suburban For Sale
46 Great Deals out of 3,551 listings starting at $36,940
2015 Chevrolet Suburban For Sale
40 Great Deals out of 1,697 listings starting at $29,000
2014 Chevrolet Suburban For Sale
21 Great Deals out of 571 listings starting at $20,784
2013 Chevrolet Suburban For Sale
44 Great Deals out of 929 listings starting at $16,777