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1994 Caprice, 5.7 L


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tpkfarms
New User

Jun 12, 2008, 6:27 PM

Post #1 of 3 (3256 views)
1994 Caprice, 5.7 L Sign In

UnimpressedHi, I have trouble to identify the problem with my 1994 chevy caprice, 5.7L engine.
Under load, after engine heated up: hesitate when accelerating, do not respond to rapid press on accelerator (feels like fuel starving)
, when accelerating sometimes a back fire like noise, when cruising whenever load is increased (eg. slight up hill) feels like intermittent missing.
The yellow light signal "engine need service soon" is not on, neither any other warning lights.
Car starts, idle as well as rev up perfect under no load..
New spark plugs, air filter, and inline fuel filter.
Fuel pressure normal and steady at idle and higher rpm's. (tested while the car is parked)
Tried new MAF and MAP sensors, no improvement.
Any idea?? Thanks, Thad


dave284
Enthusiast / Moderator
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Jun 12, 2008, 8:37 PM

Post #2 of 3 (3253 views)
Re: 1994 Caprice, 5.7 L Sign In

Thad, it could be a few things that came to mind.....water in the fuel/ vacuum leak at intake/ timing being off/ or a bad valve, try some injector cleaner, and do a vacuum test on the engine/ also check the timing.


Double J
Veteran / Moderator
Double J profile image

Jun 12, 2008, 11:08 PM

Post #3 of 3 (3252 views)
Re: 1994 Caprice, 5.7 L Sign In

Spark plug wires an "break up" / misfire under a load..



Just an added thought.



Jim


(This post was edited by JIM N on Jun 12, 2008, 11:10 PM)






 
 
 






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