1996 xjr
#23
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Hi
I have a 96 xjr 190,000 miles. Last night I was making a left turn from a dead stop. The engine all warning lights came on, the engine coughed several times and stopped. The re-start was full of ruff engine sounds, engine coughing, etc. It took two attempts to get a re-start. The car moved forward with a rough engine, then cleared and I drove home without incident and with a smooth running engine.
When I start it up in the morning and back the car out it will cough and all warning lights will come on as in a start. Sometimes it will stall. Upon a restart, I can drive off and it will remain smooth for some time and then it will repeat. Any ideas?22 July 2018 09:35
Thanks, TAG
I have a 96 xjr 190,000 miles. Last night I was making a left turn from a dead stop. The engine all warning lights came on, the engine coughed several times and stopped. The re-start was full of ruff engine sounds, engine coughing, etc. It took two attempts to get a re-start. The car moved forward with a rough engine, then cleared and I drove home without incident and with a smooth running engine.
When I start it up in the morning and back the car out it will cough and all warning lights will come on as in a start. Sometimes it will stall. Upon a restart, I can drive off and it will remain smooth for some time and then it will repeat. Any ideas?22 July 2018 09:35
Thanks, TAG
#24
#25
#26
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Tach falling to low then off with it not truly agreeing with what the engine is truly doing is an indication the Crankshaft sensor is failing . A more tell wouldbe the tach going to 0 as the engine RPM is yet to drop . The CKPS can partially fail in other aspects of it's signal use in engine regulation like the fuel pump enable . It can fail in different degrees without latching in a CEL light .The connector can be cleaned being in a bad environment and the face of the sensor can be cleaned of any debris that can interfere with the inductance air gap to the toothed relugtor gear .
There is a relay to swap first being ...................The RH engine fuse box king relay with the one in the LH.. And the ECU controlled relay with the foglight relay . see page X IN THE FILE BELOW "
Read all the CEL codes and write all the numbers down on paper while there . Then be sure to have them reset .
There is a relay to swap first being ...................The RH engine fuse box king relay with the one in the LH.. And the ECU controlled relay with the foglight relay . see page X IN THE FILE BELOW "
Read all the CEL codes and write all the numbers down on paper while there . Then be sure to have them reset .
Last edited by Lady Penelope; 07-23-2018 at 12:20 PM.
#28
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I know this isn't helpful, so my apologies in advance....
We still see a lot of these threads go unresolved with the original poster just going away, or a few resolved by changing a bunch of parts at once with no clear cause.
But I really do look forward to the day we definitively find the one or two common causes for this idle drop and die issue when coming off throttle. These are seemingly popping up more often now that the cars are accumulating high mileage and 20+ years of age. So I suspect it is something common we just haven't identified yet.
....still working on mine and have gone through most of the sensors/actuators that support ignition, fuel and air. Next on the list to check out is ECU (specifically water ingress) and perhaps IACV.
I'll start looking into that now that I have some time since the Riviera is back on the road.
We still see a lot of these threads go unresolved with the original poster just going away, or a few resolved by changing a bunch of parts at once with no clear cause.
But I really do look forward to the day we definitively find the one or two common causes for this idle drop and die issue when coming off throttle. These are seemingly popping up more often now that the cars are accumulating high mileage and 20+ years of age. So I suspect it is something common we just haven't identified yet.
....still working on mine and have gone through most of the sensors/actuators that support ignition, fuel and air. Next on the list to check out is ECU (specifically water ingress) and perhaps IACV.
I'll start looking into that now that I have some time since the Riviera is back on the road.
#30
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Hi
I have solved the issue. It was not electrical but fuel related. Cleaned the MAF sensor wires (very dirty). Clean the idle speed control motor. Ran Sea Foam through the engine to clean plugs and injectors (two cans to a half tank). Plugs were a year old and very dirty. I have a smooth running engine with a very infrequent miss at idle.
Tom
I have solved the issue. It was not electrical but fuel related. Cleaned the MAF sensor wires (very dirty). Clean the idle speed control motor. Ran Sea Foam through the engine to clean plugs and injectors (two cans to a half tank). Plugs were a year old and very dirty. I have a smooth running engine with a very infrequent miss at idle.
Tom
The following 2 users liked this post by thomas adams:
SleekJag12 (08-21-2018),
vantveer (08-16-2018)
#32
#33
Join Date: Sep 2008
Location: Damon /Houston, Texas
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Hi
I have solved the issue. It was not electrical but fuel related. Cleaned the MAF sensor wires (very dirty). Clean the idle speed control motor. Ran Sea Foam through the engine to clean plugs and injectors (two cans to a half tank). Plugs were a year old and very dirty. I have a smooth running engine with a very infrequent miss at idle.
Tom
I have solved the issue. It was not electrical but fuel related. Cleaned the MAF sensor wires (very dirty). Clean the idle speed control motor. Ran Sea Foam through the engine to clean plugs and injectors (two cans to a half tank). Plugs were a year old and very dirty. I have a smooth running engine with a very infrequent miss at idle.
Tom
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The following 2 users liked this post by Brutal:
Doug (08-17-2018),
SleekJag12 (08-21-2018)
#34
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I know this isn't helpful, so my apologies in advance....
We still see a lot of these threads go unresolved with the original poster just going away, or a few resolved by changing a bunch of parts at once with no clear cause.
But I really do look forward to the day we definitively find the one or two common causes for this idle drop and die issue when coming off throttle. .....
We still see a lot of these threads go unresolved with the original poster just going away, or a few resolved by changing a bunch of parts at once with no clear cause.
But I really do look forward to the day we definitively find the one or two common causes for this idle drop and die issue when coming off throttle. .....
In my XJR this issue was solved with new fuel pressure regulator (and fuel filter). Idles rock steady, hasn’t stalled since.
It had low pressure at idle, now fine. This has also caused long term fuel trim to drop from +10.3% to -2.3%
The following users liked this post:
SleekJag12 (08-21-2018)
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