Recently picked this up and working out a few bugs but this one has me stumped.

1991 Acura Integra Rs, OBD0 B16

Upon start up the car idles at like 2k till it gets cold.. Then after driving her for about I'd say 25-30 min, She starts to have a split second of hesitation when you let off the gas and hit it again. I can turn the key off and turn it back on, and it will run great for about 5 min then back to hesitating.

I've done the following:

Cleaned injectors, (even put a BDL rail on bc my fuel rail wasn't mounting right)

New PCV valve

New Fuel Filter

Full tune up (Ex.. plugs, wires, cap... no button Distributor was brand new so the cap really wasn't bad either)

Pull the IACV off and cleaned it... (Thought it made a HUGE difference...but still same problem)


I'm kind of at a lose...

Last night I stopped to get some petro, I was unusually low, Put 20 bucks (which was BARELY 5 gallons ) in her and went to start it, and it just turned over. Had to turn it over 3-4 times before it started. Which was odd.. Could have just been low on fuel. But that worries me about the fuel pump... or a main relay im thinking?


Any help guys, Iv'e searched and searched and I really can't figure this one out

 

fuel pump relay!!!!

 

yeah im going to change it tonight... you think thats my problem 100%?

 

changed the relay...twice...still no improvements


I found a kinked/leaking fuel line... I get great gas mileage now but still hesitation after driving for like 20 min.


Anyone? what could this problem be?

 

Put a volt meter on your TPS. Are you throwing any DTC's? How's your fuel pressure? I kinda get a hesitation on my B16 when I fuel starve it w/ my vafc (for emissions), but its not a run time issue.

-Brian