More issues once again...Please help

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Oct 1, 2017 | 10:37 AM

#16

Gunnerboy

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Joined: Dec 2015

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From: Longview WA

Any suggestions? Fuel pressure is 35 off 38 running, Brand new MSD spark plug wires, all new ignition system. And new IAC and TPS and MAP, When it fires up it idles high at 2k then starts bucking and jumping from 500 to 2500 rpm and the exaust smells like straight gas, Every once in a while it will be normal and if you drive it you lose a cylinder or 2 and it lunges up and down the road. I need this truck for next weekend any suggestions? Codes all cleared up mysteriously except for 67 CM 29,33

Oct 1, 2017 | 02:29 PM

#17

Gunnerboy

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From: Longview WA

ok so i cleared codes got it fired up and ran it for 5 mins got codes KOER 4 12 13 21 23 25 44 53 72 73..Starting to wonder if the rebuilt computer is bad? I grabbed a new map sensor and it made zero differance.

Oct 1, 2017 | 03:53 PM

#18

Mudsport96

Logistics Pro

Joined: Aug 2010

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From: Chillicothe

That's a tough one. I didnt lopk the codes up as i dont have time at the moment. Do you have a junkyard near by to swipe a computer from?

Oct 1, 2017 | 05:06 PM

#19

Gunnerboy

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From: Longview WA

No sadly junkyards with this series truck are rare around here always f250's

Oct 1, 2017 | 05:53 PM

#20

rla2005

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Joined: Oct 2005

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From: Kentucky

Fuel pressure should be 30 to 32 PSI at idle with the vacuum line attached.

There is no Code 4 so I suspect you counted rhe fladhes wrong.

Oct 1, 2017 | 06:36 PM

#21

Gunnerboy

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From: Longview WA

Ok my book said 35-40psi, And nope flashes 4 times then nothing until code 12 done this 4 or 5 times today..im really wondering if this computer is screwy.

Oct 1, 2017 | 08:21 PM

#22

rla2005

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From: Kentucky

Quote:

Originally Posted by Gunnerboy

Ok my book said 35-40psi, And nope flashes 4 times then nothing until code 12 done this 4 or 5 times today..im really wondering if this computer is screwy.

Very rare for the idle pressure to be 35 PSI. Most report, and my old truck as well, 30 to 32 PSI.

Once again, there is no Code 4. No single digit codes whatsoever.