engine surges when warmed up...
 

Need some help here...

90 si crx. runs fine when cold-i.e. less than a few min. When the engine warms up, it surges while under acceleration, and most of the time at steady speed. feels and sounds like it's down a cylinder, but I think its just running real fat when warm. Don't know what to check. Any ideas? (plugs & wires good, air filter is clean, gas is good, no check engine light or codes)

Thanks... B

RE: engine surges when warmed up...
 

bump

RE: engine surges when warmed up...
 

that is usually a vacuum leak.
replace all vacuum hoses - cost about 2 to 3 dollars.
you can look at them - but not tell it.
had the same problem - replace all except for the big one off of the brake booster. should be able to tell if that one is leaking.

RE: engine surges when warmed up...
 

i had the same prob. w/ my 96 ex coupe
find out where the throttle position sensor is and unplug it
if it doesnt do it anymore thats the prob.

RE: engine surges when warmed up...
 

same issue when i tried to install a Y8 CAI on a Y7 head.. it was throwing off the Map sensor that plugs into the intake.. good chance that could be bad or not seated properly