130 mph /service engine soon ?
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On The Tree
Joined: Oct 2002
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From: ny
130 mph /service engine soon ? i took my car for a little blast earlier and brought it up to 130 mph .when i let off the gas i was decelerating and coasting and the service engine soon light was blinking . it did it a few times and stopped what can it be?the car is running perfectly .
<small>[ April 12, 2003, 08:05 PM: Message edited by: GM ]</small>
<small>[ April 12, 2003, 08:05 PM: Message edited by: GM ]</small>
Re: 130 mph /service engine soon ? When that light blinks it means you have a misfire in one or more cylinders. If it continues to blink I would check your plugs and wires for damage.
Thread Starter
On The Tree
Joined: Oct 2002
Posts: 103
Likes: 0
From: ny
Re: 130 mph /service engine soon ? hmmm thats strange . the car has ubder 15k miles and it seems to be running fine . what could cause it to misfire at high speeds only? can that be the only reason the service engine soon light blinks ? <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />
Re: 130 mph /service engine soon ? While playing with my Predator I found that
high spark advance without some power enrichment
was giving me KR on deceleration. If you were
decelerating for a long while, maybe you logged
enough knocks to make the computer think you
had a problem. It might even go so far as to put
you into the "bad gas" program.
Deceleration is the highest spark advance region.
Max vacuum, min load / throttle. The IAC's control
of total airflow run-down is still providing some
significant cylinder charge and I bet you just
have too much spark for the fuel provided to that
set of conditions.
high spark advance without some power enrichment
was giving me KR on deceleration. If you were
decelerating for a long while, maybe you logged
enough knocks to make the computer think you
had a problem. It might even go so far as to put
you into the "bad gas" program.
Deceleration is the highest spark advance region.
Max vacuum, min load / throttle. The IAC's control
of total airflow run-down is still providing some
significant cylinder charge and I bet you just
have too much spark for the fuel provided to that
set of conditions.
Re: 130 mph /service engine soon ? +10% spark, +1% PE, I have no exhaust mods
(factory/SLP +10HP CME) but have SLP "OEM"
Blackwing lid, SLP 85mm MAF and home-ported
TB. 13.6 sec 1/4 with negative weight
reduction (50lb of video gear in the trunk).
I haven't taken the PE any further than this,
1% was enough to shut up KR but I'd like to
see how far it goes before it stops netting
further improvement.
(factory/SLP +10HP CME) but have SLP "OEM"
Blackwing lid, SLP 85mm MAF and home-ported
TB. 13.6 sec 1/4 with negative weight
reduction (50lb of video gear in the trunk).
I haven't taken the PE any further than this,
1% was enough to shut up KR but I'd like to
see how far it goes before it stops netting
further improvement.
