Quote:
Originally Posted by Zzorro
Got another 100kms from driving yesterday. 50 kms to work and back. On the way back home I didn't get a CEL but I did get a recurrence of an issue if have been trying to chase down.
The car will "stumble" or loose all power at higher revs. It will just bog right down under load. It feels like it's not getting fuel, but when I take my foot off the gas it returns to idle just fine and does not stall.
To remedy this, I shut off the car and restart it. After the restart it works fine again like nothin happened. During previous occurrences it would sort of stumble along for a min and then return to normal, be like nothing happened. But I just restart now. This happens very infrequently. Maybe once every 800kms to 1000kms? Sometimes I get a CEL and sometimes I don't.
To address this issue specifically I have replaced the fuel pump. Then I did the coils and plugs and all O2 sensors. Plus earlier I replaced MAF. Apart from the fuel pump, the latter items are all related to clearing codes and needed to be done anyways. (So I'm not throwing parts at the car for this issue specifically). But thought that getting some of these parts would take care of this issue.
Anyways, because the issue is so intermittent, I'm asking if checking fuel pressure or injectors will even help? Could this be something to do with the ECU itself maybe?
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Difficult issue to diagnose remotely but your sense that it may not be getting enough fuel may be a starting point.
Good diagnostic procedure says start with the simplest things first so:
With the age and mileage on your car when was the last time your fuel filter was changed?
I am going to assume your air filter is clean
I would do a fuel pressure test just so it is not an unknown. Not difficult to do.
How is your throttle set up?
Is it mechanical? Or throttle by wire like my 2000S?
I ask because I am wondering about possible throttle position sensor signal issues.
Does the issue happen at the same RPM range every time?
The fact that you can shut it down - restart it and everything is fine sounds like an electrical gremlin.
Which would make one think ECU issues, but if it is an electrical issue it could be in any number of places.
If you know how to data log with the Durametric ( I have never tried it) and you can force the issue to occur.
You may be able to spot something in the data log that could give you some clues as to what's going on when it looses power.