stevengude
Member
As soon as something is fixed, another thing breaks...
Ive bought an obd2 connector on ebay and used torque pro to read my fault codes . Ive attached the screen shot of the report.
Any ideas on how to fix these?
Misfire
- Thread starter stevengude
- Start date
As soon as something is fixed, another thing breaks...
Ive bought an obd2 connector on ebay and used torque pro to read my fault codes . Ive attached the screen shot of the report.
Any ideas on how to fix these?
wow. middle cylinder on each bank.
did it happen at the same time?
plugs and coils out for inspection and/or replacement I think.
If they both went at same time it makes me think it might be something further upstream - vac leak, fuel pump etc.
battery in good condition?
edit: oh no, not middle cylinder. duuh.
did it happen at the same time?
plugs and coils out for inspection and/or replacement I think.
If they both went at same time it makes me think it might be something further upstream - vac leak, fuel pump etc.
battery in good condition?
edit: oh no, not middle cylinder. duuh.
stevengude
Member
Torque pro does tell me when they happened just that they happened. Ive cleared them and ill see if them come back when i drive it tomorrow.Chris_D said:
Battery is fine, was checked a few weeks ago when my starter motor packed in
think ur first port of call is to get the plugs out, all of them, to see what condition theyre in. if theyre 50k miles then replace maybe. if not, a good clean with a soft wire brush with some carb cleaner or contact spray could solve ur problem. is ur eml light coming on?stevengude said:
further to that i'd invest in new coils (bosch only) theyre about a tenner each to do a cancelling-out test. if ur feeling sufficiently gung-ho then replacing the plugs and coils may be ur first step in cancelling out the problem.
further to that it's going to take a bit of diagnosis.
if the misfire is pretty bad i'd suggest not driving too much as unburnt fuel can damage the cats.
good luck and keep us posted re progress....
stevengude
Member
Chris_D said:think ur first port of call is to get the plugs out, all of them, to see what condition theyre in. if theyre 50k miles then replace maybe. if not, a good clean with a soft wire brush with some carb cleaner or contact spray could solve ur problem. is ur eml light coming on?stevengude said:
further to that i'd invest in new coils (bosch only) theyre about a tenner each to do a cancelling-out test. if ur feeling sufficiently gung-ho then replacing the plugs and coils may be ur first step in cancelling out the problem.
further to that it's going to take a bit of diagnosis.
if the misfire is pretty bad i'd suggest not driving too much as unburnt fuel can damage the cats.
good luck and keep us posted re progress....
My eml light isnt coming on no
Ill look at the plugs tomorrow and update
Vac leak won't cause a misfire unless its over all cylinders.
Fuel pump won't cause a misfire unless its over all cylinders.
A misfire error code would normally be a spark failure. The ECU in the older cars would not be bright enough to know that a misfire has occurred for any other reason. Obviously with newer injector technology that has changed on newer cars, but that isn't relevant here.
The rest of the advice is good, plugs, coils, check connections on the coils etc etc.
In fairness they may well be old codes, and if the engine was missing, I dare say you'd know about it.
Don't worry about it unless it actually comes back!
Fuel pump won't cause a misfire unless its over all cylinders.
A misfire error code would normally be a spark failure. The ECU in the older cars would not be bright enough to know that a misfire has occurred for any other reason. Obviously with newer injector technology that has changed on newer cars, but that isn't relevant here.
The rest of the advice is good, plugs, coils, check connections on the coils etc etc.
In fairness they may well be old codes, and if the engine was missing, I dare say you'd know about it.
Don't worry about it unless it actually comes back!
I would move one of those coil packs to another cylinder and see if the fault follows. That's an easier first step than plugs, but would assume it's either/or both. You could replace all the sparks and then coils if needed.
stevengude
Member
Just a quick update.
I got in the car to go to work this morning and it sounded horrific. I took our lass's car to work and andy kindly came and looked at the car tonight and i had flooded the engine with fuel when just turning it on for a brief moment - a couple of monents later it was solved. Not misfiring but still reading misfire codes on torque pro.
Booked in with Andy on Thursday to look at coils and plugs and try and fix an oil leak (will upload picture tomorrow of the oil).
Will keep you all updated
I got in the car to go to work this morning and it sounded horrific. I took our lass's car to work and andy kindly came and looked at the car tonight and i had flooded the engine with fuel when just turning it on for a brief moment - a couple of monents later it was solved. Not misfiring but still reading misfire codes on torque pro.
Booked in with Andy on Thursday to look at coils and plugs and try and fix an oil leak (will upload picture tomorrow of the oil).
Will keep you all updated
4Chris_D said:think ur first port of call is to get the plugs out, all of them, to see what condition theyre in. if theyre 50k miles then replace maybe. if not, a good clean with a soft wire brush with some carb cleaner or contact spray could solve ur problem. is ur eml light coming on?stevengude said:
further to that i'd invest in new coils (bosch only) theyre about a tenner each to do a cancelling-out test. if ur feeling sufficiently gung-ho then replacing the plugs and coils may be ur first step in cancelling out the problem.
further to that it's going to take a bit of diagnosis.
if the misfire is pretty bad i'd suggest not driving too much as unburnt fuel can damage the cats.
good luck and keep us posted re progress....
All good ideas, BUT...not gonna do swaptronics here. Modern day diagnostics isn't about swapping parts, its about proving 100% they are not working properly.
Oscilloscope current ramp waveform on each coil first.
Same on each injector. Possible injector flow test.
Running relative compression test via scope on the engine also, to rule out mechanical issues.
Definitely a spark plug check though by the old fashioned removal method LOL!
Interestingly fuel trim on both banks was perfect, pre CAT O2 sensors were switching fast and well, post CAT sensors were reading a good solid 0.7 volts. So no CAT damage there.
No doubt Steven will keep you all informed on thursday how all the tests went. I'll certainly enjoy doing them!
Andy.
stevengude
Member
Andy will be able to offer a more technical view than me, but in summary..
We took the car for a drive with the scanner plugged in, and everything looked fine.
Took the car back to andys workshop. All plugs and coils came out and were inspected, and all looked fine.
Some more tests were run and all coils passed with flying colours. Fuel line checked and all fine.
Then on to trying to find a suspected oil leak. On tuesday we spotten a lot of smoke and some liquid on a pipe below the engine. However today when we got the car in the air we couldnt find a single spot of oil anywhere. Maybe it was just having a bad day on tuesday
Rest of car was checked and no problems found.
Putting the misfire down to a split lower intake boot, part ordered for £26 and in going to try and fit on saturday before inevitably failing and giving it andy to do.
We took the car for a drive with the scanner plugged in, and everything looked fine.
Took the car back to andys workshop. All plugs and coils came out and were inspected, and all looked fine.
Some more tests were run and all coils passed with flying colours. Fuel line checked and all fine.
Then on to trying to find a suspected oil leak. On tuesday we spotten a lot of smoke and some liquid on a pipe below the engine. However today when we got the car in the air we couldnt find a single spot of oil anywhere. Maybe it was just having a bad day on tuesday
Rest of car was checked and no problems found.
Putting the misfire down to a split lower intake boot, part ordered for £26 and in going to try and fit on saturday before inevitably failing and giving it andy to do.
stevengude
Member
Further update
After a lot of swearing ive fitted the new intake boot this morning, also changed air filter.
This was the old part
Also took my washer fluid tank out and cleaned the filters. Amazed how much crap was in there!
After a lot of swearing ive fitted the new intake boot this morning, also changed air filter.
This was the old part
Also took my washer fluid tank out and cleaned the filters. Amazed how much crap was in there!
Why a 'lot of swearing' re the intake boot? Its not such a difficult job. You could have gone a bit further and taken the throttle body out to de-varnish the flap and the icv to de-carbonize it. Worthwhile jobs if theyve never been done, seeing as you were in the vicinity of them.
Any improvements to the misfire after replacing?
Any improvements to the misfire after replacing?
stevengude
Member
Not a difficult job no, but very fiddly when you have big hands trying to get to the little screws (and im a complete novice).Chris_D said:
I think its fixed it, no codes at the moment ill check again tomorrow after a 30min run
stevengude
Member
z4all said:
Thanks
The car is running fine now, a joy to drive
thanks for everyones advice