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I recently found this web site and glad I did, you guy have a lot of info that may help!
I have a 1988 Turbo Coupe that has gremlins!! The first problem is a high idle condition that has stumped me and the shops I've taken it to ( most have refused to work on it). Short history of the car- It belongs to the original owner, purchased new on December 24, 1988. It has been garage kept and is in excellent shape with only 60,000 miles. It is on it's second set on tire's and all major systems and components are factory original. I still have a couple of years supply of R12! I've known the owner for seven years and have worked on the car a few times during the first two, basic tune up, ect, then took over all maintenance over the last five. The owner complained to me, seven years ago, that the engine will occasionally go into a high idle condition. Initially this would happen once or twice a week and has become more frequent since. It will happen at any time or condition, cold motor, warmed up, and during any driving condition. It always goes to 2300 RPM, and the engine tries to adjust for accessories being turned off and on. It will start to decrease RPM then return to 2300 RPM, AC on will cause a slight increase in RPM then it will return to 2300. Anytime you turn the ignition switch off then back on(even at 35 mph) the high idle condition goes away, but will return eventually. The TPS has been changed 4 times by others and once by myself and that has not had any effect on this condition. All TCB's and recall's have been complied with. The intake has been off three times for other maintenance, valve cover caskets,ect. No known vacume leaks.
During my search for the solution to the high idle another intermittent problem has started. Engine runs rough, I'm getting the fault code 14, loss of PIP. 2 distributors, 4 TFI's and days of chasing wires and voltage have yielded nothing. All engine compartment grounds have been cleaned, reference voltage checked ok, other items replaced: coil, plugs, plug wires, distributor cap and rotor. Primary and secondary ignition circuits checked ok. I just replaced the computer after running out of other options. That didn't help either!
I have learned that this motor is very picky about settings and precision is a must! All the basic settings are dead on the spec's, and it runs great up to the point the two problems arise. I've run out of options and have gone through every trouble shooting check in the book a couple of times without success. It's to the point I'm afraid I can no longer see the problem and need a fresh approach! Any clues to where to look????
I have a 1988 Turbo Coupe that has gremlins!! The first problem is a high idle condition that has stumped me and the shops I've taken it to ( most have refused to work on it). Short history of the car- It belongs to the original owner, purchased new on December 24, 1988. It has been garage kept and is in excellent shape with only 60,000 miles. It is on it's second set on tire's and all major systems and components are factory original. I still have a couple of years supply of R12! I've known the owner for seven years and have worked on the car a few times during the first two, basic tune up, ect, then took over all maintenance over the last five. The owner complained to me, seven years ago, that the engine will occasionally go into a high idle condition. Initially this would happen once or twice a week and has become more frequent since. It will happen at any time or condition, cold motor, warmed up, and during any driving condition. It always goes to 2300 RPM, and the engine tries to adjust for accessories being turned off and on. It will start to decrease RPM then return to 2300 RPM, AC on will cause a slight increase in RPM then it will return to 2300. Anytime you turn the ignition switch off then back on(even at 35 mph) the high idle condition goes away, but will return eventually. The TPS has been changed 4 times by others and once by myself and that has not had any effect on this condition. All TCB's and recall's have been complied with. The intake has been off three times for other maintenance, valve cover caskets,ect. No known vacume leaks.
During my search for the solution to the high idle another intermittent problem has started. Engine runs rough, I'm getting the fault code 14, loss of PIP. 2 distributors, 4 TFI's and days of chasing wires and voltage have yielded nothing. All engine compartment grounds have been cleaned, reference voltage checked ok, other items replaced: coil, plugs, plug wires, distributor cap and rotor. Primary and secondary ignition circuits checked ok. I just replaced the computer after running out of other options. That didn't help either!
I have learned that this motor is very picky about settings and precision is a must! All the basic settings are dead on the spec's, and it runs great up to the point the two problems arise. I've run out of options and have gone through every trouble shooting check in the book a couple of times without success. It's to the point I'm afraid I can no longer see the problem and need a fresh approach! Any clues to where to look????