I have yet another idle/performance issue with an M20. I have searched through alot of threads, but every time I try to replace what someone else has suggested, I get nowhere, and it is costing me money.
I have an engine that runs rough at start, does the idle search thing (ICV works), has a hesitation when I hit the gas for just a split second, revs through the range just fine when it gets going, and got decent gas milage until recently.
I have replaced the main and fuel relays, cap and rotor, wires, plugs, coolant temp sensor, the sensor next to that, hose that runs to from the intake to the valve cover, adjusted the valves, cleaned the ICV, and tried to adjust the TPS. I have also just replaced the O2 sensor.
The funny thing is that it will idle fine if I remove the FPR vacuum line and just leave it suck air. It will try to die again when I reconnect it.
I have also been told that the MAF that is in my car is a rebuild. I don't know if that matters, but the valve in it seems like it turns alright (seal on the top has been compromised, but clean inside).
Edit: Another thing, is the MPG gauge on the dash. After doing some of the parts replacements, I also tried to adjust the TPS, as well as clean some of the parts out in that area. Since then, the MPG gauge now pegs out to 40+, until I get going, and then pegs down to the 0. Once I let off the gas, it slams back over to the 40+ side. If it goes to the middle for any reason, it does not st there long.
If anyone has any idea what is going on, could you please advise. I am spending way too much money trying fix this, and afraid I will either have to sell it (no time to keep this up), or pay a mechanic more money I just won't have. Thanks.
Oh, and if anyone in the PDX has an extra MAF I could try, I would appreciate it.
I have an engine that runs rough at start, does the idle search thing (ICV works), has a hesitation when I hit the gas for just a split second, revs through the range just fine when it gets going, and got decent gas milage until recently.
I have replaced the main and fuel relays, cap and rotor, wires, plugs, coolant temp sensor, the sensor next to that, hose that runs to from the intake to the valve cover, adjusted the valves, cleaned the ICV, and tried to adjust the TPS. I have also just replaced the O2 sensor.
The funny thing is that it will idle fine if I remove the FPR vacuum line and just leave it suck air. It will try to die again when I reconnect it.
I have also been told that the MAF that is in my car is a rebuild. I don't know if that matters, but the valve in it seems like it turns alright (seal on the top has been compromised, but clean inside).
Edit: Another thing, is the MPG gauge on the dash. After doing some of the parts replacements, I also tried to adjust the TPS, as well as clean some of the parts out in that area. Since then, the MPG gauge now pegs out to 40+, until I get going, and then pegs down to the 0. Once I let off the gas, it slams back over to the 40+ side. If it goes to the middle for any reason, it does not st there long.
If anyone has any idea what is going on, could you please advise. I am spending way too much money trying fix this, and afraid I will either have to sell it (no time to keep this up), or pay a mechanic more money I just won't have. Thanks.
Oh, and if anyone in the PDX has an extra MAF I could try, I would appreciate it.
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