car problem
Thread Starter
Pole Position
Joined: Jun 2009
Posts: 269
Likes: 0
From: Hawaii
okay weird. today i started up my car. and let it idle for about 5 minutes. nothing was wrong with the car except on deceleration at like 3000 there would be a rattling/buzzing(sound like something loose) sound from under the car. maybe the exhaust is loose? leaked?
Probable Cause:
-spark plugs,wires,hose,oils,etc.
-exhaust leak
-iacv
-MAF and throttle body
-Catalytic Converter
-Intake Leak
-Fuel Pump
-Fuel Injections
-ECU
-??? any more suggestions of what can be the cause
you say that the problem goes away when the car is warmed up. well before the car is warmed up it runs in open loop and uses the ECT engine coolant temperature sensor to know how much fuel you need. and once the car is warmed up it runs on closed loop and relys on the oxygen sensors and MAF for fuel. you can rule out IACV as that only effects idle, if you had a cloggged cat you would notice great decrease in power. you can see if its the fuel pump ecu by bypassing it with a paper clip to B+ and Fp in the diagnostic port under the hood. replace your ECT sensor and report back
-spark plugs,wires,hose,oils,etc.
-exhaust leak
-iacv
-MAF and throttle body
-Catalytic Converter
-Intake Leak
-Fuel Pump
-Fuel Injections
-ECU
-??? any more suggestions of what can be the cause
you say that the problem goes away when the car is warmed up. well before the car is warmed up it runs in open loop and uses the ECT engine coolant temperature sensor to know how much fuel you need. and once the car is warmed up it runs on closed loop and relys on the oxygen sensors and MAF for fuel. you can rule out IACV as that only effects idle, if you had a cloggged cat you would notice great decrease in power. you can see if its the fuel pump ecu by bypassing it with a paper clip to B+ and Fp in the diagnostic port under the hood. replace your ECT sensor and report back
Thread Starter
Pole Position
Joined: Jun 2009
Posts: 269
Likes: 0
From: Hawaii
Probable Cause:
-spark plugs,wires,hose,oils,etc.
-exhaust leak
-iacv
-MAF and throttle body
-Catalytic Converter
-Intake Leak
-Fuel Pump
-Fuel Injections
-ECU
-??? any more suggestions of what can be the cause
you say that the problem goes away when the car is warmed up. well before the car is warmed up it runs in open loop and uses the ECT engine coolant temperature sensor to know how much fuel you need. and once the car is warmed up it runs on closed loop and relys on the oxygen sensors and MAF for fuel. you can rule out IACV as that only effects idle, if you had a cloggged cat you would notice great decrease in power. you can see if its the fuel pump ecu by bypassing it with a paper clip to B+ and Fp in the diagnostic port under the hood. replace your ECT sensor and report back
-spark plugs,wires,hose,oils,etc.
-exhaust leak
-iacv
-MAF and throttle body
-Catalytic Converter
-Intake Leak
-Fuel Pump
-Fuel Injections
-ECU
-??? any more suggestions of what can be the cause
you say that the problem goes away when the car is warmed up. well before the car is warmed up it runs in open loop and uses the ECT engine coolant temperature sensor to know how much fuel you need. and once the car is warmed up it runs on closed loop and relys on the oxygen sensors and MAF for fuel. you can rule out IACV as that only effects idle, if you had a cloggged cat you would notice great decrease in power. you can see if its the fuel pump ecu by bypassing it with a paper clip to B+ and Fp in the diagnostic port under the hood. replace your ECT sensor and report back
weird today the car seemed to run fine. the only problem i have now is on deceleration i hear a rattling,sputtering sound, and sounds like it's coming from the driver side under the car. maybe a exhaust leak or cracked/loose bracket? because i also have a very strong fuel/stink smell when the car is running. what could be the cause of this?
if my problems reoccur again tomarrow i'll do the above you suggested. thanks
Last edited by grindin8o8; Jul 24, 2009 at 03:36 AM.
I strongly believe it's your maf sensor then. I have all of the same symptoms as you and I recently destroyed mine on accident trying to clean it with a maf sensor spray I bought at advanceauto
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grindin8o8
SC - 1st Gen (1992-2000)
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Feb 4, 2010 05:06 AM
