runs bad
Lead Driver
Joined: Feb 2003
Posts: 8,140
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From: Oak Harbor, OH
Okay. You said it's running rich, indicated by soot on the rag. This is pure hell on the o2 sensor so it probably needs replaced. I would check the fuel pressure and make sure it's within spec (40 to 45psi).
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my 5.0 seems to be having the same problem, only I just tuned it up today, and now its running rougher than before and its shaking while I drive down the road. I pulled codes and it said EGR and o2, but my step dad says they could be old codes. should I check the fuel pressure regulator? Also will gapping them at .045 instead .044 make a difference? our gapper didnt have the .044. Should I try changing the oil too?
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Fleet Mechanic
Joined: Jul 2004
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From: va
Reset codes??
I think if you remove the ground off the battery for ten minutes that resets the codes. Try for codes again. Did you replace the O2 and egr? Is that why he think its old codes? Somtimes when you change electrical parts it runs bad for a while, thats why you should reset the codes. You should test these two parts with a volt meter first you could have a bad wire going to them.. How many miles on the O2 sensor? I think the manual says 80,000 miles before replacing. Just my 2 cents 
Did you read the codes yourself?
Did you read the codes yourself?
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Fleet Mechanic
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From: va
Originally Posted by 90f150moneypit
Pull the throttle body off and clean it thoroughly too.
Since cleaning the IAC allowed it to run for a longer period but still acting up, I would guess it's no good. More often than not if cleaning the IAC results in positive results it's time to replace it. Even if it were to completely fix the problem, a short time later they fail anyway but at least you would know that the problem is from the IAC.
They aren't cheap but I would spring for it if it were me, but I would also get that TB off and cleaned good (paying close attention to the air passage and EGR port).
Since cleaning the IAC allowed it to run for a longer period but still acting up, I would guess it's no good. More often than not if cleaning the IAC results in positive results it's time to replace it. Even if it were to completely fix the problem, a short time later they fail anyway but at least you would know that the problem is from the IAC.
They aren't cheap but I would spring for it if it were me, but I would also get that TB off and cleaned good (paying close attention to the air passage and EGR port).
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Joined: Feb 2004
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From: va beach VA
Originally Posted by mike L
Thanks, will do. I have a 1" tube that runs along the straight six head. It looks like its metal and moldeled to the head. It has six 1/4" tubes coming straight up from the side of the head. Right across from the spark plugs. Right at the head it has a small fuel leak, still wet after a few hours. It has a 1" size rubber hose at each end and the other end that runs back about the injectors is hollow. What it this part, why is there a small fuel leak, must be coming up from the head?
What are some thing that would make my truck run rich? Cleaned the plugs and the after 10 minutes of running, it had had black dry sooty ....? carbon? on all of them. Thanks again
What are some thing that would make my truck run rich? Cleaned the plugs and the after 10 minutes of running, it had had black dry sooty ....? carbon? on all of them. Thanks again
Posting Guru
Joined: Jan 2003
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From: Still under the hood in O
Your not looking for a kit. Your looking for a can of TB cleaner just like carb cleaner. The cleaners that go in the tank or through the rail do not reach the TB. Air is the only thing that the TB controls (besides the TPS signal).
You need to pull it off and take the TPS off and spray it real good and use a tooth brush. Make sure the EGR port,air passages and the back of the throttle plates are clean.
And as mentioned - the injectors could still be leaking.
You need to pull it off and take the TPS off and spray it real good and use a tooth brush. Make sure the EGR port,air passages and the back of the throttle plates are clean.
And as mentioned - the injectors could still be leaking.
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Fleet Mechanic
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From: va
Originally Posted by ssn randy
are you talking about the fuel rail, tube supplies fuel to injectors, leaking injector may cause this. to check it, pull the wire and read between the two leads on the injector, should be 2.5v, check your manual for this test and correct voltages, but i think if less than 1.8v its bad
Thanks
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Fleet Mechanic
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From: va
Originally Posted by 90f150moneypit
Your not looking for a kit. Your looking for a can of TB cleaner just like carb cleaner. The cleaners that go in the tank or through the rail do not reach the TB. Air is the only thing that the TB controls (besides the TPS signal).
You need to pull it off and take the TPS off and spray it real good and use a tooth brush. Make sure the EGR port,air passages and the back of the throttle plates are clean.
And as mentioned - the injectors could still be leaking.
You need to pull it off and take the TPS off and spray it real good and use a tooth brush. Make sure the EGR port,air passages and the back of the throttle plates are clean.
And as mentioned - the injectors could still be leaking.
Senior User
Joined: Feb 2004
Posts: 423
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From: va beach VA
yes it could be the regulator, to much pressure. that may be why the leak near the head. leaking around the injector spraying fuel up the head toward that 1" hollow pipe. is the leak right above one of the injectors. don't know what it looks like, mine is 5.0L
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Fleet Mechanic
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From: va
Originally Posted by ssn randy
yes it could be the regulator, to much pressure. that may be why the leak near the head. leaking around the injector spraying fuel up the head toward that 1" hollow pipe. is the leak right above one of the injectors. don't know what it looks like, mine is 5.0L
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Fleet Mechanic
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From: va
I had it towed. Cant rent a efi fuel pressure tester, and its 120.00 for the tester. Couldn't no test for codes. I asked the garage to call me back with the readings. What's the fuel pressure suppose to be at with key on not running? How about while running? If I get a good reading with key on and not running. Is that ok or do I need it to run? Thanks guys