GSL-SE questions....
02-13-02, 08:42 PM
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GSL-SE questions....
I recently purchased an 85 GSL-SE from an older, responsible type person (I have all the repair history going back to the original window sticker), they were selling to buy a new car. I though it was a good deal so I jumped on it. After about 2 weeks of driving I noticed a few things that didn't seem to be there before. A high idle (mis-adjusted TPS), surging at idle and acceleration in gear on it's own (faulty signal to the BAC, the solonoid was pulsing the Vacuum signal to the valve) and the car was definately running rich from these conditions. I managed to find some specs for the sensors and went about checking them and determined these problems and corrected them. The past week the Main Cat Converter comes apart, probably from running so out of spec (rich) for so long before I got the car. I ended up temporarly fixing the problem...... now I am insearch of a new converter. My question is: Does any body know of anything else that could cause this rich condition? Is there something I am not checking? I have not made my way to the ecu yet..... I do know the oxy sensor was replaced about a year ago. I do fix cars for a living, but can not find any quality wiring diagrams or repair instructions for this Model. I do also know that no one seems to know much about it. Any personal experiances or knowledge would be welcome! Thanks..... Rich
02-13-02, 10:56 PM
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Re: GSL-SE questions....
Welcome to the forum.
I hope you don't mind me picking apart your post to add my thoughts.
Also, try the search button at the top of the page for cat suppliers, and check http://www.mazdatrix.com/ for them.
Maybe something else will come to mind regarding your richness ...
-John.
I hope you don't mind me picking apart your post to add my thoughts.
Originally posted by yellosc
I know you mentioned you fixed these, but...
A high idle (mis-adjusted TPS)
Not likely the TPS. High idle is usually just the Air Adjust Screw,a vacuum leak, a sticking throttle shaft or an intake duct leak.
surging at idle and acceleration in gear on it's own
Now that would be the TPS.
faulty signal to the BAC, the solenoid was pulsing the Vacuum signal to the valve
That would be normal. That's how the ECU controls the BAC and ACV, etc. Rapid pulsing of the solenoids controls the diaphragms in the valves.
and the car was definitely running rich from these conditions.
Not likely from those problems. They will cause rough, maybe high idle and drivability problems but not make it run rich. Why do you say it's rich?
If it is rich, there is a pot near the air filter to adjust mixture. Oval, mounted with two screws and the adjustment screw is covered with epoxy. It does not normally need to be adjusted. If the epoxy is missing, just disconnect the BAC connector and adjust for highest idle. If the epoxy is intact, don't touch it.
The injectors may be leaky, causing it to run rich, but usually you would have flooding problems as the first sign.
If it runs bad at idle and when on the throttle, the Air Flow Meter flap may be sticking. Again, depending on the symptoms.
If you have not already done so, clean around the throttle plates. Helps all kinds of idle problems. If you are running rich only at idle, it will help.
Regarding your question: if the new O2 sensor is good, and the above doesn't help, I can't think of anything else for the moment that would cause it to run rich. If you have more detail, it would help. [/B]
I know you mentioned you fixed these, but...
A high idle (mis-adjusted TPS)
Not likely the TPS. High idle is usually just the Air Adjust Screw,a vacuum leak, a sticking throttle shaft or an intake duct leak.
surging at idle and acceleration in gear on it's own
Now that would be the TPS.
faulty signal to the BAC, the solenoid was pulsing the Vacuum signal to the valve
That would be normal. That's how the ECU controls the BAC and ACV, etc. Rapid pulsing of the solenoids controls the diaphragms in the valves.
and the car was definitely running rich from these conditions.
Not likely from those problems. They will cause rough, maybe high idle and drivability problems but not make it run rich. Why do you say it's rich?
If it is rich, there is a pot near the air filter to adjust mixture. Oval, mounted with two screws and the adjustment screw is covered with epoxy. It does not normally need to be adjusted. If the epoxy is missing, just disconnect the BAC connector and adjust for highest idle. If the epoxy is intact, don't touch it.
The injectors may be leaky, causing it to run rich, but usually you would have flooding problems as the first sign.
If it runs bad at idle and when on the throttle, the Air Flow Meter flap may be sticking. Again, depending on the symptoms.
If you have not already done so, clean around the throttle plates. Helps all kinds of idle problems. If you are running rich only at idle, it will help.
Regarding your question: if the new O2 sensor is good, and the above doesn't help, I can't think of anything else for the moment that would cause it to run rich. If you have more detail, it would help. [/B]
Maybe something else will come to mind regarding your richness ...
-John.
Last edited by FJ; 02-13-02 at 10:59 PM.
02-14-02, 12:05 PM
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John,
Thanks for the reply. I sware I did adjust the tps and the idle droped to the point of almost stalling so I then went to adjust the idle valve (BAC) and got it to run great for about a week and then the surging started (1K rpm- 2500 rpm) discovered the valve to be causing it , but discovered the plused vacuum making it surge. If you have a GSL-SE try to disconnect the vacuum line to the valve and see what it does.... It is now running better ,but the cat is destroyed so I can not check the exhaust mixture unless you know the specs for a car w/ no cat??? Before the cat went out it was running 850 HC and about 2.5 CO, if I rember correctly. I will need to get a new cat and see what the reading are then. I had thought about a sticking injector , but the car does not flood unless you move it out of the drive way and shut it off quickly (normal) It does start w/ a little work after that. It is an original motor w/ 156K on it.
Rich
Thanks for the reply. I sware I did adjust the tps and the idle droped to the point of almost stalling so I then went to adjust the idle valve (BAC) and got it to run great for about a week and then the surging started (1K rpm- 2500 rpm) discovered the valve to be causing it , but discovered the plused vacuum making it surge. If you have a GSL-SE try to disconnect the vacuum line to the valve and see what it does.... It is now running better ,but the cat is destroyed so I can not check the exhaust mixture unless you know the specs for a car w/ no cat??? Before the cat went out it was running 850 HC and about 2.5 CO, if I rember correctly. I will need to get a new cat and see what the reading are then. I had thought about a sticking injector , but the car does not flood unless you move it out of the drive way and shut it off quickly (normal) It does start w/ a little work after that. It is an original motor w/ 156K on it.
Rich
