Wrangler 4.0i HO 1993:
When I start the jeep it runs fine, but the second time sometimes it runs bad, I can hear it from the exhaust. When I hit the gas, nothing
reacts, I can feel that the enige is willing, but it doesn't rev up. Link there's no fuel. If I start a third time it runs great again.
When I drive in 5th gear 90 km/h and I hit the gas for power, same problem, but not all the time, it doen't rev up, untill I hit the gas slowly.
Also, when I let loose the gaspedal, the exhaust makes hard banging noises.
From the first time on, I always did a reset via the batterypoles and the problem was gone. Later on I learned that just turning off/on the ignition
whas enough to make it run okay. I never had any codes! (Only 12,33,55)
I think it's a timing or a fuel/air problem.
I already did:
1) replaced complete ignition: sparks, cables, rotor, coil etc.
2) replaced fuelfilter, O2 sensor
3) replaced vacuumlines
4) cleaned the throttlebody/airfilter
5) cleaned the fuellines, gastank en fuelpump.
I also have a grand cherokee V8 so it was possible for me to change some sensors like TPS, CTS etc. I referd to RockAuto Auto Parts
to check if
the sensors were the same.
I also checked the fuelpressure in idle mode, 39psi en 3psi (vavuum) maybe I should also check it when I'm driving?
I have this problem for 7 months now, when I bought the car and it drives me grazy!! I also posted on the dutch jeepforum en everybody is helpfull
but nothing seems to work.
Is there someone with some new ideas? Please help and thnaks in advance guy's!!