Bad idle, lack of power and smells gas - Ignition ?
#1
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Hello everyone
Here are some (bad) news about my latest toy.
I have purchased this 96 X300 with ΰ 3.2L engine.
Since I have it, I have not managed to make it run properly.
I have swapped the engine (cyl N°2 had almost no compression) with a good unit (compression test performed and everything seems good). (https://www.jaguarforums.com/forum/x...advice-152112/)
The symptoms:
Bad idle, with revs ranging from 600 to 800 RPM. When I first start the engine, the idle is fine. But when I first accelerate, it becomes instable.
At idling, exhaust gas smells very bad, with signs of poor combustion
When driving, the engine seems to be lacking power between 1000 and 2000 RPM
Above 2000 RPM, the engine sounds good and seems powerful but it is hard to get there
No error code showing on the OBD
Here is what I have done so far:
2 brand new O2 sensors. Signals checked and it seems OK (see previous post)
Checked ignition coils. Each coil receives 12.2V when the engine is not running, 14,4V when it is running. All coils correctly mounted.
Brand new battery
Cleaned the throttle body
Cleaned the Intake Air Temperature
Cleaned and tested the MAFS: the output voltage is OK and the reading of the signal by the ECM is OK too/ I checked it while driving with the OBD tool.
Checked fuel pressure: With contact on: 3 bars. With engine running: 2.8 bars, with small decrease (0.2 bars) when accelerating. So I assume it is fine on this side.
Brand new fuel filter
Checked the crankshaft position sensor. Its resistance is 1308 ohms. I have read that new ones should be 1350. I guess the difference is acceptable.
6 brand new spark plugs with correct specs. No oil or moisture within the plug holes
Checked for air leaks (vacuum lines, exhaust, etc) with an home-made smoke machine and found nothing
So, here are my interrogations:
1. Do I need to do a sort of remap or reprog of the ECM since I changed the engine? I went to a local garage that seems to be into vintage cars and he directly told me I needed a reset / reprog of the ECU to be sure all sensors and so on were accurate. I am a little confused, to be honest.
2. To me and according to what I have been reading of this forum (and other ones), it sounds like a problem with the ignition. What do you think? How to get sure everything is OK on the ignition side? (coil packs, harness, signal, etc.)
3. Do you have any other ideas?
Thanks a lot for reading, the help and patience![Icon Beerchug](https://www.jaguarforums.com/forum/images/smilies/icon_beerchug.gif)
Julien4020
Here are some (bad) news about my latest toy.
I have purchased this 96 X300 with ΰ 3.2L engine.
Since I have it, I have not managed to make it run properly.
I have swapped the engine (cyl N°2 had almost no compression) with a good unit (compression test performed and everything seems good). (https://www.jaguarforums.com/forum/x...advice-152112/)
The symptoms:
Bad idle, with revs ranging from 600 to 800 RPM. When I first start the engine, the idle is fine. But when I first accelerate, it becomes instable.
At idling, exhaust gas smells very bad, with signs of poor combustion
When driving, the engine seems to be lacking power between 1000 and 2000 RPM
Above 2000 RPM, the engine sounds good and seems powerful but it is hard to get there
No error code showing on the OBD
Here is what I have done so far:
2 brand new O2 sensors. Signals checked and it seems OK (see previous post)
Checked ignition coils. Each coil receives 12.2V when the engine is not running, 14,4V when it is running. All coils correctly mounted.
Brand new battery
Cleaned the throttle body
Cleaned the Intake Air Temperature
Cleaned and tested the MAFS: the output voltage is OK and the reading of the signal by the ECM is OK too/ I checked it while driving with the OBD tool.
Checked fuel pressure: With contact on: 3 bars. With engine running: 2.8 bars, with small decrease (0.2 bars) when accelerating. So I assume it is fine on this side.
Brand new fuel filter
Checked the crankshaft position sensor. Its resistance is 1308 ohms. I have read that new ones should be 1350. I guess the difference is acceptable.
6 brand new spark plugs with correct specs. No oil or moisture within the plug holes
Checked for air leaks (vacuum lines, exhaust, etc) with an home-made smoke machine and found nothing
So, here are my interrogations:
1. Do I need to do a sort of remap or reprog of the ECM since I changed the engine? I went to a local garage that seems to be into vintage cars and he directly told me I needed a reset / reprog of the ECU to be sure all sensors and so on were accurate. I am a little confused, to be honest.
2. To me and according to what I have been reading of this forum (and other ones), it sounds like a problem with the ignition. What do you think? How to get sure everything is OK on the ignition side? (coil packs, harness, signal, etc.)
3. Do you have any other ideas?
Thanks a lot for reading, the help and patience
![Icon Beerchug](https://www.jaguarforums.com/forum/images/smilies/icon_beerchug.gif)
Julien4020
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#13
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Hello everyone,
Finally one update on this thread ! I have found the origin of the problem with this car. There are 2:
One injector was faulty, so I replaced it. The car run better but still not perfect. At least it no longer stalled.
Then I tried different parts with no joy.
In the end, I bought a new MAFS and replaced the old one ! Hurrah ! It worked great but the idling was standing at 2000RPM. But at least it started well and was revving perfectly.
So I played with the little sensor under the throttle body (I do not remember the name, I read the tutorial on this forum) and now it is idling perfectly and revving perfectly too !
So, happy days.
Thank you all for the help and the precious info you gave me.
I am enjoying it on the summer now.
What I have done so far:
cure rust on rear arches (I will put a post to present the results)
Change steering wheel with half-wood one
Clean interior
Fit some adapter for MP3 on original radio
Next steps will be:
Remake headliner
Fit new speakers. Old ones are dead.
Polish and clean
adjust one pulley that is screaming
Finally one update on this thread ! I have found the origin of the problem with this car. There are 2:
One injector was faulty, so I replaced it. The car run better but still not perfect. At least it no longer stalled.
Then I tried different parts with no joy.
In the end, I bought a new MAFS and replaced the old one ! Hurrah ! It worked great but the idling was standing at 2000RPM. But at least it started well and was revving perfectly.
So I played with the little sensor under the throttle body (I do not remember the name, I read the tutorial on this forum) and now it is idling perfectly and revving perfectly too !
So, happy days.
Thank you all for the help and the precious info you gave me.
I am enjoying it on the summer now.
What I have done so far:
cure rust on rear arches (I will put a post to present the results)
Change steering wheel with half-wood one
Clean interior
Fit some adapter for MP3 on original radio
Next steps will be:
Remake headliner
Fit new speakers. Old ones are dead.
Polish and clean
adjust one pulley that is screaming
#14
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Noticed you have resolved the engine regulation but I will leave this on here as it my help someone else reading this post . Does the STFT go from the 24.2 toward 0.0 as you throttle up like mine ? I was told this indicates a vacuum leak on the intake manifold side . A leak in the exhaust from cracked manifolds and donut gaskets will allow fresh high level O2 to suck in between pulses and bias the O2 sensers to command a rich STFT . Mine had a damaged downpipe flair that the donut seats and you could visibly see black exhaust gasses escape . Suggest spray down downpipe nuts to free up spinning torque and tighten them up again for as you have been there before you know what a pain it is to completely remove and inspect .
I'll get you a cheap speaker repair and screaming pulley info later as I edit this reply after errands .
Thanks , Parker
I'll get you a cheap speaker repair and screaming pulley info later as I edit this reply after errands .
Thanks , Parker
Last edited by Lady Penelope; 08-04-2017 at 10:09 AM.