Engine is mis-firing and running rich!
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Engine is mis-firing and running rich!
I just recently did a fresh rebuild on my ls block and when the car got back to me it was doing 2 things. At idle it is misfiring and it is running rich. I changed the plugs and the wires are good. Please HELP! I think it is one of two things; Fuel Injectors took a crap or there is a vacuum leak. What is your take. Your $0.02 are always welcome.
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Re: Engine is mis-firing and running rich!
I just recently did a fresh rebuild on my ls block and when the car got back to me it was doing 2 things. At idle it is misfiring and it is running rich. I changed the plugs and the wires are good. Please HELP! I think it is one of two things; Fuel Injectors took a crap or there is a vacuum leak. What is your take. Your $0.02 are always welcome.
Running rich is a byproduct of the misfire. When you have a misfire, the unburnt gas will cause the rich condition.
Solve the misfire problem and your rich condition should be resolved as well.
I would perform a compression test and a leak down test to determine the condition of the motor.
Also, what is timing set to? Is it obd 1 or 2? Any CEL?
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Re: Engine is mis-firing and running rich!
Timing was set to stock. the timing is dead on. Its obd2. It has a CEL but i havent checked it. A compression test is not needed cause i just rebuilt the motor.
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Re: Engine is mis-firing and running rich!
It cant be the timing cause it only misfires while idling. When i am coasting it runs fine.
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Re: Engine is mis-firing and running rich!
Just because it's a fresh build doesn't mean squat. If you're assuming because it's a fresh build and nothing can go wrong, then you have a lot to learn. Did you rebuild the engine yourself? Did you do the install yourself?
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Re: Engine is mis-firing and running rich!
No I didn't do it myself. I went to a professional shop. The guy said he has a gut feeling it's the injectors but I want some other feedback from other sources b4 I continue
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Re: Engine is mis-firing and running rich!
lol the cel is pretty much tellin you whats wrong...this aint the 60's anymore bro.
deff get back to us on that. i would say maybe a map sensor? you probably forgot to plug something in
deff get back to us on that. i would say maybe a map sensor? you probably forgot to plug something in
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Re: Engine is mis-firing and running rich!
that's the thing that has me confused... I had this problem problem before the rebuild. But i did not feel it as much. I think its because of the upped compression. I had this problem that i would be driving regularly and it would just like start to stumble on the RPM and go down and down until i mashed the gas pedal to the floor and then the car would jump. This problem would come like once in 2 weeks. So I dont want to leave the injector out just yet.
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Re: Engine is mis-firing and running rich!
When was the last time you did an electronic tune up? New wires, cap, rotor, you may even have a faulty ignition coil. I had a similar problem when that contact spring on my ignition coil was bent and wasn't making good contact with the distributor. Car was slugish till I hit around 3400-3600 rpm, then the car would just pull.
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Re: Engine is mis-firing and running rich!
BTW... this is what the computer said. Oxygen sensor, and random misfire in cylinders 1 2 and 4
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Re: Engine is mis-firing and running rich!
thats what mine did too the machine shop ****ed me and only replaced 12 of the 16 valves they siad the other 4 were fine i even asked if ther were sure and 2 weeks later they tuliped
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Re: Engine is mis-firing and running rich!
my 91 is doing the exact same thing...except my fuel pressure is also 12lbs too low.
stumbles under a load...
fuel psi low...
runs rich...
kind of ironic huh?
stumbles under a load...
fuel psi low...
runs rich...
kind of ironic huh?
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