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Discussion Starter #1
i have a 2000 4runner. i have noticed a decrease in power and the idle
is rough. the check engine light is on and it is giving the P0300 and
P0301 code which is random/multiple cylinder misfire and cylinder 1
misfire. i have replaced the spark plugs and switched the coil packs
from #1-2 and nothing has changed. also if i unplug the number 1 fuel
injector, nothing changes....unplug # 2 and the idle drops. also, if i
plug in the #1 wire into #2 then it runs the same. i also have tried
swapping the #1 and #2 fuel injectors and that didn't help.....as you
probably can tell, i am totally stumped...the next thing i'm going to
check is the compression. but if anyone has any ideas as to what this
might be....it would be greatly appreciated


thanks
 
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Discussion Starter #2
A compression check will confirm/eliminate a lot of things that it could
be - burnt valve, hole in piston, cam lobe wiped, leak in head gasket.

"Dylan" <[email protected]> wrote in message
news:[email protected]
>i have a 2000 4runner. i have noticed a decrease in power and the idle
> is rough. the check engine light is on and it is giving the P0300 and
> P0301 code which is random/multiple cylinder misfire and cylinder 1
> misfire. i have replaced the spark plugs and switched the coil packs
> from #1-2 and nothing has changed. also if i unplug the number 1 fuel
> injector, nothing changes....unplug # 2 and the idle drops. also, if i
> plug in the #1 wire into #2 then it runs the same. i also have tried
> swapping the #1 and #2 fuel injectors and that didn't help.....as you
> probably can tell, i am totally stumped...the next thing i'm going to
> check is the compression. but if anyone has any ideas as to what this
> might be....it would be greatly appreciated
>
>
> thanks
>
 

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Did you find the answer? I have the same problems. Changed the O2 sensors, changed the plugs, changed the ignition coils. No luck still have the problem running on LPG and petrol.
 
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