A month or so ago I had a couple of my spark plug wires end up laying
on my headers and getting burned through, which of course caused a bad
driving experience, bucking under accel, etc., I replaced the wires as
soon as I found out that was the problem, I also replaced those 2 spark
plugs, the dead cylinders were fixed of course.. but now I'm having
problems at cold startup and at anything above say 80% throttle. This
is a 93 5.0 btw.
At cold startup, it starts fine, but it runs really poorly, if u
give it too much gas to quickly it dies. After it warms up for a
couple minutes it is fine at idle, and at part throttle through all the
rpm range, but no matter the rpm, it accelerates fine till you get to
about 80-90% WOT then it noses over and loses all power, almost like it
hit the rev limiter, it will also backfire at times if you keep your
foot in it. I had just replaced my O2 sensors about 6 months ago, I
was thinking maybe having 2 dead cylinders messed the one up, but at
cold start and at wot is the only times that it doesn't use the o2
sensors correct?
I replaced all the spark plugs, all looked good, maybe a little
lean, I also have an A/F gauge, which does it's normal bouncing at
idle, but falls off the the lean side of the range as you accellerate,
and gives no reading at WOT. What do I need to look at next.. FPR?
The plugs say it's running fine, or a little lean, my A/F gauge says
lean on the part throttle tip in period.. but it acts like it's loading
up on fuel, so I'm confused.. any help would be appreciated.
I further inspected my car a minute ago.. found I had a missing header
bolt, so I replaced that too, I had been wondering why my exhaust was
so loud.. I've also been thinking could it just be the ignition coil..
I believe it's the original, and i'm sure having 2 wires grounded to
the headers didn't help it's life. I replaced all the spark plug
wires, not just the 2 that were bad, and I guess I'm gonna go ahead and
get a cap and rotor, and a new coil and see if that helps.
> A month or so ago I had a couple of my spark plug wires end up laying
>on my headers and getting burned through, which of course caused a bad
>driving experience, bucking under accel, etc., I replaced the wires as
>soon as I found out that was the problem, I also replaced those 2 spark
>plugs, the dead cylinders were fixed of course.. but now I'm having
>problems at cold startup and at anything above say 80% throttle. This
>is a 93 5.0 btw.
>
> At cold startup, it starts fine, but it runs really poorly, if u
>give it too much gas to quickly it dies. After it warms up for a
>couple minutes it is fine at idle, and at part throttle through all the
>rpm range, but no matter the rpm, it accelerates fine till you get to
>about 80-90% WOT then it noses over and loses all power, almost like it
>hit the rev limiter, it will also backfire at times if you keep your
>foot in it. I had just replaced my O2 sensors about 6 months ago, I
>was thinking maybe having 2 dead cylinders messed the one up, but at
>cold start and at wot is the only times that it doesn't use the o2
>sensors correct?
>
> I replaced all the spark plugs, all looked good, maybe a little
>lean, I also have an A/F gauge, which does it's normal bouncing at
>idle, but falls off the the lean side of the range as you accellerate,
>and gives no reading at WOT. What do I need to look at next.. FPR?
>The plugs say it's running fine, or a little lean, my A/F gauge says
>lean on the part throttle tip in period.. but it acts like it's loading
>up on fuel, so I'm confused.. any help would be appreciated.
you have a rich mixture focktard
anytime u have backfire
check spark again
measure ohms max 6000 per foot
woods2...@cox.net wrote:
> I further inspected my car a minute ago.. found I had a missing
header
> bolt, so I replaced that too, I had been wondering why my exhaust was
> so loud.. I've also been thinking could it just be the ignition
coil..
> I believe it's the original, and i'm sure having 2 wires grounded to
> the headers didn't help it's life. I replaced all the spark plug
> wires, not just the 2 that were bad, and I guess I'm gonna go ahead
and
> get a cap and rotor, and a new coil and see if that helps.
A coil is a possibility, since it's losing power on the top.
Is your check engine light illuminated? Regardless, I'd have the
computer checked for codes. Most auto parts store will do it for you
for free.
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