Persistant Misfire

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Mar 31, 2012 | 12:41 PM

#21

bigyeller

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I put a coil on it the other day and it still did it right after. But now a day later its not doing it but its also a little cooler out

Mar 31, 2012 | 12:43 PM

#22

bigyeller

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And would it take a drive cycle for the computer to fix the problem

Mar 31, 2012 | 12:51 PM

#23

HeyYou

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From: Clayton MI

Depends on what the original problem was. You could try just resetting the computer... (disconnect the battery for a few minutes) and see if that doesn't improve it's attitude any.

Mar 31, 2012 | 02:34 PM

#24

zman17

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From: NH

Quote:

Originally Posted by bigyeller

Mine is doin the same thing but on cylinder 7 under a load in overdrive. My compression is at 150 and fuel pressure is at 50 psi. I changed plugs wires cap rotor fuel injector coil. Checked the cat and o2 sensor. Ohmed the injector wire to the computer and also the injector itself. Even did a voltage test. Is there anything else i can look for.

Exactly how did you check the cat?

Mar 31, 2012 | 08:35 PM

#25

bigyeller

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Quote:

Originally Posted by zman17

Exactly how did you check the cat?

You can take a low pressure psi gage and get a few fittings from a hardware store and a spark plug nonfouler. 14mm and start the engine and it shouldnt read more than half a pound if it does the cat is bad.

Mar 31, 2012 | 08:36 PM

#26

bigyeller

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Truck is fixed.

Mar 31, 2012 | 09:05 PM

#27

HeyYou

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From: Clayton MI

Quote:

Originally Posted by bigyeller

Truck is fixed.

What fixed it?

Mar 31, 2012 | 11:19 PM

#28

gdstock

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From: Austin, TX

Quote:

Originally Posted by HeyYou

What fixed it?

I am wondering also!

Apr 1, 2012 | 04:09 AM

#29

bigyeller

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I unpluged the coolant temp sensor wich puts the computer into base time. Then i took my scanner and read the ignition adv. ° and it was around 27° so i turned the distributor till it was 8 to 10° adv. Thats it. Just had me thinkin how it got so advanced