Computer help 1990 f-150
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Computer help 1990 f-150
After searching the wrecking yards for a computer for my 1990 F-150 , i came up with a computer for the same , with the only differance being the truck that the computer came from was an XLT model with air and cruise, how close does the service number have to be , and will the fact the new computer was for an optioned truck make much of a differance .
i know there is a signal to the engine to increase the idle when you put the air on , but will this also give me a high idle or improper reading
the truck runs fine , but it does seem a little fast at idle ,
as i never drove or even had heard the truck run before i got it , i just wondered if someone may have had the same problems
if anyone requires , or has info to i.d the use of the computers , i can get both service #s off the units
big daddy chuck
i know there is a signal to the engine to increase the idle when you put the air on , but will this also give me a high idle or improper reading
the truck runs fine , but it does seem a little fast at idle ,
as i never drove or even had heard the truck run before i got it , i just wondered if someone may have had the same problems
if anyone requires , or has info to i.d the use of the computers , i can get both service #s off the units
big daddy chuck
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From: Tn.
the progamaing code the code should be like 1ft-1ta fyi that is a ECU tha i just bought from rockauto.com for 48 bucks its a reman but what ain't and yes it matters by trans, ac,cc also vairations from production dates you should get an exact match. i could not find a match at a junk yard the dealership wanted 255 advance was 118 and kile i said rock auto was 48.95
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help
the donor truck and my truck are exactly the same mechanically, 5.0 L, aod,1/2 ton even as luck would have it oth built in october of 1989, the service codes on the computers are the same except for the last digit, drivability and performance are great, no power problems, no eratic idle searching , just seems a bit high on the RPM'S.
i a going to put it on the mastertech scanner today to check the air idle motor and to see if any codes come up on the truck, the one problem with getting a truck that you have no knowledge of its real history .
i'm guessing on everything , will get back to you later with an update.
big daddy chuck
i a going to put it on the mastertech scanner today to check the air idle motor and to see if any codes come up on the truck, the one problem with getting a truck that you have no knowledge of its real history .
i'm guessing on everything , will get back to you later with an update.
big daddy chuck
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From: Easton,Ks
Speed Control is not wired to the PCM (EEC) so this would not matter.
The A/C only supply’s 12 Volts to the PCM Pin #10 when the A/C is on so this will not matter either if you are putting a unit out of an A/C truck into a non-A/C truck.
So from reading your post you will be OK.
Have fun and good luck.
The A/C only supply’s 12 Volts to the PCM Pin #10 when the A/C is on so this will not matter either if you are putting a unit out of an A/C truck into a non-A/C truck.
So from reading your post you will be OK.
Have fun and good luck.
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thanks for info...
i was wondering about the engine speed control when you put on the air conditioning , my brother had said something about the computer compensating for the power loss, i do know that the harness for the ac pump is there, was just wondering
thanks again
thanks again
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From: Easton,Ks
Originally Posted by big daddy chuck
i was wondering about the engine speed control when you put on the air conditioning , my brother had said something about the computer compensating for the power loss, i do know that the harness for the ac pump is there, was just wondering
thanks again
thanks again
The diagram is the circuit inside the EEC to show you that it will not float high and increase your RPM. Some electrical devices if you take a wire off its input will go to 2-5 Volts at the input of the CPU (IC1), this is called floating high.
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emissions test
i had the truck tested on the emissions machine at my brothers shop today, everything is okay , the high idle problem was an attemp to keep the truck running while the last mechanic ran it off a pressurised fuel test can ,
i reset the idle at 675 rpm and the truck runs great, no off idle stumble , or anything, thanks again for the info about the computer unit , i was going to look for an exact replacement, but now there is no need .
4 ball joints a couple of tie rod ends and the old girl will pass her safty next week
big daddy chuck
i reset the idle at 675 rpm and the truck runs great, no off idle stumble , or anything, thanks again for the info about the computer unit , i was going to look for an exact replacement, but now there is no need .
4 ball joints a couple of tie rod ends and the old girl will pass her safty next week
big daddy chuck
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From: oregon
hey chuck, how did you reset your idle?, Dr. Reese, are you happy with the reman EEC? I'm thinking i might need one, I have a intermitent high idle, I've replaced and tested every sensor/ controller under the hood. the only thing i can come up with is my EEC is supplying 11.5 volts to my IAC compared to the 10.5 required. vacuum leaks have been ruled out.
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i did remove the Air Idel Control, and clean it up , after a few backfires from the truck the unit must have had some carbon or something stuck in it , i cannot say how happy i am with the truck , runs smooth now , and for me ... getting out of the old coal burner dodge (diesel) , driving at hi-way speed with no road noise is a pleasure
i'm going to regret this but the truck is getting duals , mustand 5.0L shorty factory headers , and magna flow 2 1/2" in and 2 1/2" out mufflers, guess i can't leave anything alone...
big daddy chuck
i'm going to regret this but the truck is getting duals , mustand 5.0L shorty factory headers , and magna flow 2 1/2" in and 2 1/2" out mufflers, guess i can't leave anything alone...
big daddy chuck