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Old 07-09-2010, 11:23 AM   #1
toyotadan [OP] toyotadan is offline
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Misfire

I have a misfire in the # 1 cylinder .2.7 ltr.Motor runs rough,when i unplug injector there is no difference in running so i asume injector is pluged?? this was taken to autozone and tested.new plugs made no difference either.when i unplug #2 it makes a huge difference.
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Old 07-09-2010, 11:37 AM   #2
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toyotadan,
Probably not an injector. I worked in the automotive field for way too many years before I finally landed an easy, government job. During those years I could count on one hand the number of bad injectors I came across. I can't remember if your model has a coil pack for each of the plugs or if it is like my 95 that has a distributor. If it has coil packs, swap the #1 and # 2 packs and start the vehicle. More than likely the miss will change cylinders. Wala, bad coil pack. If it is a distributor type, check for a bad cap/rotor and/or bad plug wire. Bad coil packs were very common on the Honda/Isuzu motors. lmk how it works out.
Fred.

PS: forgot to say that if it is missing because of fire it will not change when you unplug the injector harness because there is no fire to burn the fuel.
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Old 07-09-2010, 11:42 AM   #3
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alot of people that have have this problem have burnt valves... how many miles are on your engine? do a compression check to see. normally cyl 1 and 3 are the issues. dont want to scare you just trying to cover a few bases... hope im wrong
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Old 07-09-2010, 03:54 PM   #4
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checked compresion all close to the same
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Old 07-09-2010, 04:39 PM   #5
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would burn't valves make it just run ruff or will it also back fire???? compresion seems good
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Old 07-10-2010, 12:13 AM   #6
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got it ,was a bad injector,truck runs great!!
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