3.1l fuel mixture is off
#1
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Car: 1991 Chevy Camaro RS
Engine: V6 3.1L
Transmission: Auto
Axle/Gears: Stock
3.1l fuel mixture is off
my car is fouling out sparks plugs within a week. Currently it is idling rough and I have changed the wires, plugs, cap and button, Ignition coil and a oil change. The tps and map sensor(Nov 2014) are new also .also New injectors and fpr(Nov 2014). Changed the pump in 2013
My car starting to idle rough one night last week. Then it went away the next morning. The following night the problem came back and my car begin sputtering also. I made it home and I have been able to drive it since. Would this issue be timing related?
My car starting to idle rough one night last week. Then it went away the next morning. The following night the problem came back and my car begin sputtering also. I made it home and I have been able to drive it since. Would this issue be timing related?
Last edited by Rell_1218; 05-29-2015 at 07:57 PM.
#2
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Re: 3.1l fuel mixture is off
my car is fouling out sparks plugs within a week. Currently it is idling rough and I'll change the wires plugs cap and button. Ignition coil and a oil change. The tps and map sensor are new also . New injectors and fpr. Changed pump in 2013
My car starting to idle rough one night last week. Then it went away the next morning. The following night the problem came back and my car begin sputtering also. I made it home and I have been able to drive it since. Would this issue be timing related?
My car starting to idle rough one night last week. Then it went away the next morning. The following night the problem came back and my car begin sputtering also. I made it home and I have been able to drive it since. Would this issue be timing related?
#3
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Car: 1991 Chevy Camaro RS
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Car: 89 Camaro RS running MS2X
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Re: 3.1l fuel mixture is off
Check for vacuum leaks. A small leak on/near the MAP line could cause a rich condition.
#6
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Car: 1991 Chevy Camaro RS
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Re: 3.1l fuel mixture is off
I changed the plugs again..it ran great for a week and then the problem returned.
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Car: 2003 Hyundai Tiburon GT
Engine: 2.7L V6
Transmission: 6-speed
Axle/Gears: 4.41
Re: 3.1l fuel mixture is off
Pull the FPR vacuum line and prime the fuel pump. Diaphragm in the FPR might be leaking fuel directly into the intake. It might be new-ish, but check anyways.
Then get a pressure gauge and check the fuel pressure. Could also be a leaking injector. Follow this up by checking injector resistance on both banks. Should be 4 ohms. Shorted injector could be holding others on same bank open.
Then get a pressure gauge and check the fuel pressure. Could also be a leaking injector. Follow this up by checking injector resistance on both banks. Should be 4 ohms. Shorted injector could be holding others on same bank open.
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#8
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Re: 3.1l fuel mixture is off
I think injectors should be more like 13-16 ohms each with little variance.
#9
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Car: 1991 Chevy Camaro RS
Engine: V6 3.1L
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Re: 3.1l fuel mixture is off
Pull the FPR vacuum line and prime the fuel pump. Diaphragm in the FPR might be leaking fuel directly into the intake. It might be new-ish, but check anyways.
Then get a pressure gauge and check the fuel pressure. Could also be a leaking injector. Follow this up by checking injector resistance on both banks. Should be 4 ohms. Shorted injector could be holding others on same bank open.
Then get a pressure gauge and check the fuel pressure. Could also be a leaking injector. Follow this up by checking injector resistance on both banks. Should be 4 ohms. Shorted injector could be holding others on same bank open.
#11
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Re: 3.1l fuel mixture is off
You bought the wrong fuel pressure gauge. Should've bought an Actron fuel pressure tester for fuel injection.
#13
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Car: 1991 Chevy Camaro RS
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Re: 3.1l fuel mixture is off
I was able to check the fuel pressure today. With the key in the On position, it started at 40 psi and dropped almost immediately. When I started the car, the fuel pressure was 35 psi. I'm going to check the injectors tomorrow
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