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V6 Start Up and Hesitation
Posted by Scott.Fitzgerald (more from Scott.Fitzgerald) on Wed, 30 May 2001 19:23:13
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

I've been having some very intermittent problems with my '94 V6 for about a
month now, and I'm hoping there are some answers out there.  Searching the
NG and BBS seems to indicate that these are common problems.

First, occasionally when starting the car, it will:
- take too many cranks to catch, but sometimes starts right away
- when it fires it will immediately bog down for a few seconds, and then
shoot up to 2000-2500 rpm and then settle into a nice ~900rpm idle

This is occuring more frequently now, and doesn't seem to be influenced by
ambient temperatures, or a hot or cold engine.

Second, after starting and driving for 1-2 minutes (usually), the Check
Engine (MIL) light will come on and stay on for 30s to 2 minutes.  While the
MIL is on, stop and go driving feels like I'm in 3rd gear - *very* bogged
down.  I will sometimes get this same driveability behaviour *without* the
MIL being on.

Third, very occasionally while 'just driving along', the engine will
hesitate.  It does not die, just stops pulling.  I'll be driving along at
110km/h and the engine will stop pulling for a split second to a couple of
seconds, and then catch itself.  It's as if I shifted into neutral, but
standing on the throttle yields no response.  Interestingly, if I have the
cruise on when this occurs, it will resume to the cruising speed when it
catches (provided I didn't hit the brake or clutch, of course).  I also get
this behaviour occasionally at low speed (i.e. trying to leave a stop sign
in first gear and having the guy behind you lay on the horn because you
ain't moving!)

Dealer hasn't been able to figure anything out because it's too
intermittent.  MIL returns crankshaft sensor problems, but testing of the
sensor indicates it is OK.  MIL also returns O2 sensor problems, but again
the sensor tests OK, and is triggered by something further up the line, I
would think.

I don't know that the crankshaft sensor could be responsible for my start-up
problem, which is happening quite regularly now (3 or 4 times out of 5
starts), but I think it would explain the driveability problems.

Front 3 plugs look OK, although they are due for a change.  I'm still
getting great gas mileage, and performance from the car for the other 95% of
driving time is great, maybe a bit slow on throttle response.

I've also seen a few people comment on having the 'TCS OFF' light suddenly
come on, and toggling the dash switch has no effect.  I also get this very
occasionally (maybe a dozen times in the 150,000km that I've had the car),
but I've had it twice in the last 7 to 10 days.  Not sure if that's an
indication of something.

Does anyone have some suggestions on DIY diagnostics that I could do?  If
any body has had similar problems, what was/were the cure/cures?

Thanks very much!
Scott.
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