help!!!! im screwed again

[roderick]

my car runs rich and back fires at idle rpms. that is the first problem. the second problem is the car will not idle. I have no codes coming up on the scanner. I thought it was the computer so I upgraded to an 87 computer and air temp. sensor but that wasn't the problem either, so I changed the mass air flow sensor to the LS-1 sensor and translator plus set for factory settings. Someone please help me I need to drive. I've had this problem for a while but I haven't had time to figured it out yet. Any suggestions are welcome and greatly appreciated.

 

[boostmaster]

Large vacumn leak, bad wires, or bad coil/ module. If you have checked all of that already it could be cam sensor timing off. Just shooting in the dark since you weren't more specific on it's previous running condition.

 

[roderick]

Thanx man, I changed the wires but not the coil and module. I was saving the most expensive part for last....GREATLY APPRECIATED.

 

[boostmaster]

Look Dude!! by no means do I suggest that you go changing parts which as you can see is a very expensive means of trouble shooting. I'm simply trying to point you in the right direction of components to check and verify if they're working or not. After checking these things then you can determin which parts are good or bad. It could be a 2.00 problem and you might spend 100.00 fixing it by just replacing parts.

 

[6SENSE]

Wires changed before or after problem started? Make sure wires arent switched, are on tight, not burnt, not leaking/grounded, etc. What type of wires used, some just done cut it with these engines. Mise well double check that first, then proceed to testing coil/module.

 

[roderick]

to boostmaster by no means whould i hold you responsible for my mistakes but the only things i have not checked are the coil/module and the cam sensor. so ill try it . if that is the problemo then thank you if not i have more work to do. to 6sense i changed the wires after the problemo. thanks guys

 

[6SENSE]

If you had some known good pieces (maybe from someone elses car?) to swap that would be great for process of elimination. If not at least try checking the resistance on the coil first. Take a multi meter set to check ohms and look for 11k-13k across the towers. If not within that range, youve most likely found that the problem is the coil. If it checks out okay, could be the mod. However as you already may know, when it comes to automobiles of any make, there are often multiple problems and it could be both (especially on used cars). Good luck, your starting in the right area.

Just thought of something else to add to the list of possiblities, after checking ignition items. You say it is backfiring. From the intake, or out the exhaust? How rich are we talking here? Cam sensor, timing chain was already mentioned. I have had experience with a TR that had injector problems so bad that raw gas was actually coming out of the tail pipes. It came about all of a sudden with no warning. The car finally stopped running all together. Took forever to figure it out. Finally tried swapping injectors and it was fine. The stockers were stuck open or ??? On this car backfire was definately out the exhaust (unburnt gas/very rich), thats why I asked.