Crappy Idle...engine Misses...

[Chriskaw440]

Ok, here's all the new stuff: (1990 SE)

 

spark plugs, cap & rotor, ignition coil, knock sensor, plenum and intake manifold gaskets, lifters, TPS sensor, IAC valve, cleaned MAF sensor, all vacuum lines (and appear to be all connected correctly),

seafoamed intake system (via brake booster line), etc etc.... No ECU codes....flashes "55" which is 'all good'

 

engine seems to struggle during warm-up....I can hear it suckin air in through the air filter (K&N cone style) every time it misses. gas mileage still seems about right. Engine still pulls good and

strong under load. response is instant when playing with the throttle either at the throttle body or gas pedal. idles at normal RPM for the most part, better when fully warm of course.

 

while it was idling I pulled the vacuum line off the EGR valve and it made no difference, and I felt no suction either at idle or while giving it gas. I'm wondering if that's the culprit?

 

Fuel injectors all sound good and clean.

 

After all this work, I really figured it would be better than it is.....I think I am missing something but cant quite put my finger on it. I have not yet replaced the plug wires but they really don't have a ton of miles on them...maybe 30,000 or so...if even that much.

 

after most all of the major work was done (like the lifters) and such, of course I had the battery disconnected. When I reconnected everything and fired it up...she purred like a kitten. Then eventually...after a day or so....started the sputtering and missing, I am assuming after the ECU had fully reset everything/parameters?

 

any ideas are welcome thanks, Chris