Error Codes from ECM (SE)
Discussion
I used the info on this site to check the ECM codes as I have been getting intermitant Warning light flashing.
It has shown code
24 Vehicle speed sensor circuit
35 Idle speed error
Can anyone shed further light on the potential problems causing these codes.
The symptoms are that the car is running too high HC's
tends to stall at junctions when hot & hesitates when pulling away. The rad fans tend to switch on and off of their own free will.
The car currently has a non Lotus 02 sensor which according to the MOT gas analyser is working within the parameters of a normal 02 sensor.
Any thoughts would be greatly appreciated.
It has shown code
24 Vehicle speed sensor circuit
35 Idle speed error
Can anyone shed further light on the potential problems causing these codes.
The symptoms are that the car is running too high HC's
tends to stall at junctions when hot & hesitates when pulling away. The rad fans tend to switch on and off of their own free will.
The car currently has a non Lotus 02 sensor which according to the MOT gas analyser is working within the parameters of a normal 02 sensor.
Any thoughts would be greatly appreciated.
The VSS is mounted on the right rear hub and might need to be changed. Perform the VSS test with the freescan hooked up and right rear wheel jacked up. Check for vac leaks in your hoses, all the hoses. Also sometimes cars with closed fuel systems do not like it when there is air entering fuel/vent hoses leading from the tanks.
Calvin
Calvin
I have an '89 non-SE. When I first bought it the radiator fans would always come on when the key was turned. After three years the fuel pump relay would not engage. I jumpered it out. After another year the car would stop and finally it would not run smooth at all. Bottom line. The ECM was going out. After changing the ignition module, good GM numbers but from what I hear the wiring is different and gives a crank shaft position error, I changed the ECM and no problems. Very cheap too, $80.
Apparently, the ECM goes out one bit at a time.
Reuse the chip but change the box. Running fine now except for the check engine light since I didn't change back the module and have always had a code 26 which even Lotus cannot figure out. Their reply, does it GO? Yes! then who cares? I still have 25 MPG and can hit 145 MPH. Good enough for me.
Hope this helps.
Apparently, the ECM goes out one bit at a time.
Reuse the chip but change the box. Running fine now except for the check engine light since I didn't change back the module and have always had a code 26 which even Lotus cannot figure out. Their reply, does it GO? Yes! then who cares? I still have 25 MPG and can hit 145 MPH. Good enough for me.
Hope this helps.
I have just purchased an S4S and I'm VERY pleased with it. A fantastic car and a big improvement on 1986 turbo I used to own.
Can anyone help with this niggling problem.
Quite recently the battery died on me. I recharged it and took the car out for a spin at the weekend. I've now noticed that the car seems to hesitate when it is cruising -- this wasn't the case before the death of the battery. However, push the pedal and it takes off as usual. Could this problem be a result of the ECM being disconnected -- i.e., relearning parameters?
Thanks for any advice
Can anyone help with this niggling problem.
Quite recently the battery died on me. I recharged it and took the car out for a spin at the weekend. I've now noticed that the car seems to hesitate when it is cruising -- this wasn't the case before the death of the battery. However, push the pedal and it takes off as usual. Could this problem be a result of the ECM being disconnected -- i.e., relearning parameters?
Thanks for any advice
The more info I gather on this subject the more confusing it gets.
My local Lotus dealer does not want to know.
I have now been told that their is more to O2 sensors than merely number of wires, there is Zirconium and Titainium which run on different currents and principals.
Also I was told to discount the speed sensor code because the car was stationary at the time of reading the codes.
Anyone know the equivailent Bosch part code for the O2 sensor someone mentioned earlier on this forum.
The latest Problem that has developed while at the paint shop, when they tried to start the car to move it, a 2ft flame shot out the exhaust upon start up and the car procceeded to run on 2 cylinders so they switched it off. I have been down to have a look at the car and it will not start at all now.
Upon turning the ignition key should you be able to hear the fuel pump prime up? As I cannot at the moment.
Any further help would be welcomed. please.
My local Lotus dealer does not want to know.
I have now been told that their is more to O2 sensors than merely number of wires, there is Zirconium and Titainium which run on different currents and principals.
Also I was told to discount the speed sensor code because the car was stationary at the time of reading the codes.
Anyone know the equivailent Bosch part code for the O2 sensor someone mentioned earlier on this forum.
The latest Problem that has developed while at the paint shop, when they tried to start the car to move it, a 2ft flame shot out the exhaust upon start up and the car procceeded to run on 2 cylinders so they switched it off. I have been down to have a look at the car and it will not start at all now.
Upon turning the ignition key should you be able to hear the fuel pump prime up? As I cannot at the moment.
Any further help would be welcomed. please.
Yes the ECU has been reset to default. use the fuel brand and type you normally would use and after a tank or two it will be back to normal after it learns the fuel. Also if the car was running and you slowly lose battery voltage like when you have a bad alternator this makes the ECU run lean and strange. When thisa happens check pull the plugs to check them out and see they aren't burnt up, then reset the ECU.
Calvin 90 SE
Calvin 90 SE
When my alternator died and I was slowly losing voltage on the way home one night it strated to run like it was on 2 cyl. and backfired. It was terrible it happened 3 blocks from my house on a cold fall day. I had to walk home and get the battery out of my other car and it started right up. What a relief. I think you will be okay once the battery is charged.
Calvin
Calvin
I took a trip down to the paint shop and put the freshly charged battery on and discovered the Fuel pump was now working and not been working previously due to the alarm being armed and the siren being disconected.
However even with the fuel pump now working the engine would turn over and try to start but would only run on 2 pots with the throtle slightly depressed.
Any Thoughts?
However even with the fuel pump now working the engine would turn over and try to start but would only run on 2 pots with the throtle slightly depressed.
Any Thoughts?
Start with the basics.
Check the condition of the plug wires.
Pull the plugs and see what kind of shape they are in.
Ground the plug to see if you are getting spark at each plug. Check fuel pressure. Make sure the cams are in time and see if the dots align on the cam. Sometimes if the backfire is severe it can jump teeth and alter timing. So hard to do things by long distance. Things that take a few minutes to check all of a sudden take so long.
Hopefully eveything is alright.
Calvin
Check the condition of the plug wires.
Pull the plugs and see what kind of shape they are in.
Ground the plug to see if you are getting spark at each plug. Check fuel pressure. Make sure the cams are in time and see if the dots align on the cam. Sometimes if the backfire is severe it can jump teeth and alter timing. So hard to do things by long distance. Things that take a few minutes to check all of a sudden take so long.
Hopefully eveything is alright.
Calvin
It did not back fire while I was there yesterday it just ran on two pots.
I do not think the painters took the car for a spin as it has no lights bumpers trim etc on or in the car due to me stripping her for painting. They also were aware the car was suffering from a problem with the engine management when I took the car in.
I will be checking the mechanical timing etc in a few hours I will let you know what I find.
Thanks for the help.
Mike
I do not think the painters took the car for a spin as it has no lights bumpers trim etc on or in the car due to me stripping her for painting. They also were aware the car was suffering from a problem with the engine management when I took the car in.
I will be checking the mechanical timing etc in a few hours I will let you know what I find.
Thanks for the help.
Mike
I have the engine back on 4 pots I simply removed the plugs which were soaked in petrol cleaned them heated them up and she fired straight up. The car is definatly over fueling.
The Bosch code for the replacement 02 sensor I have had checked out by my local Bosch dealer and it turns out to be based on a Peugeot or Honda sensor. My car has a peugeot sensor fitted.
I am about to fit a new temp sensor in the next hour or so to see if this cures the problem as the fans are still cutting in and out at will,which could mean this sensor is sending an extremely mixed signal to the ECM. I know I had this problem with a Golf GTI a few years ago and it turned out to be the temp sensor.
Wish me luck.
Mike
The Bosch code for the replacement 02 sensor I have had checked out by my local Bosch dealer and it turns out to be based on a Peugeot or Honda sensor. My car has a peugeot sensor fitted.
I am about to fit a new temp sensor in the next hour or so to see if this cures the problem as the fans are still cutting in and out at will,which could mean this sensor is sending an extremely mixed signal to the ECM. I know I had this problem with a Golf GTI a few years ago and it turned out to be the temp sensor.
Wish me luck.
Mike
The engine is now running much better after fitting the new temp sensor. I think for the first time the car has started to go through the proper re-learning proccess from cold start up.
The fans are still switching on at will but not for as long a period as before.
Here is another question. When the throttle is pressed and the revs are increased to say 3000RPM when the throttle is then closed and the RPM is dropping is it normal for the car to spit and cough through the exhaust and occaisionally back fire. (NB my car has a sports exhaust with the cat and EBP removed) My understanding was that the fuel was cut off in over run to prevent this happening.
My car could still be over fueling but not to the extent it was before fitting the new temp sensor.
Any comments?
Cheers Mike
The fans are still switching on at will but not for as long a period as before.
Here is another question. When the throttle is pressed and the revs are increased to say 3000RPM when the throttle is then closed and the RPM is dropping is it normal for the car to spit and cough through the exhaust and occaisionally back fire. (NB my car has a sports exhaust with the cat and EBP removed) My understanding was that the fuel was cut off in over run to prevent this happening.
My car could still be over fueling but not to the extent it was before fitting the new temp sensor.
Any comments?
Cheers Mike
quote:
Here is another question. When the throttle is pressed and the revs are increased to say 3000RPM when the throttle is then closed and the RPM is dropping is it normal for the car to spit and cough through the exhaust and occaisionally back fire.
It does cough and stumble at bit if reving the engine while the car is at a stop then backing off. The backfire is not normal.
Calvin 90 SE
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