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Ford 460 diagnostics problem
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Ford 460 diagnostics problem
I have an F 53 Ford Chassis motor homewith the 1994 460 cid V-8. It idles poorly and dies a lot when cold. I took it to a Ford truck dealer, who said the diagnostic computer would not tell them what is wrong. They also made it die more often and idle worse, and the engine check light is now on whereas it wasn't before. Can anyone tell me what part I need to enable the trouble codes to show (and where it is on the engine)? Also, any ideas to check for the idle/dying before I take it back to a shop?
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From: Easton,Ks
Originally Posted by tebreuer
I have an F 53 Ford Chassis motor homewith the 1994 460 cid V-8. It idles poorly and dies a lot when cold. I took it to a Ford truck dealer, who said the diagnostic computer would not tell them what is wrong. They also made it die more often and idle worse, and the engine check light is now on whereas it wasn't before. Can anyone tell me what part I need to enable the trouble codes to show (and where it is on the engine)? Also, any ideas to check for the idle/dying before I take it back to a shop?
You just ground C199 VIP Data Link Connector LH rear of engine compartment, on bracket.
Set in the driver’s seat with paper and pin, turn the key to on and count the flashes on the Check engine light (MIL).
For more information go to:
http://fordfuelinjection.com/?p=13
Read your codes and post them back and we will help you more.
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From: Easton,Ks
Originally Posted by tebreuer
I'll try this. It will take a week or more because I'm off on a business trip tomorrow. Don't Ford technicians try this when the code reader doesn't work? I wonder why they didn't.
There is also a possibility that he did not have a good connection to his reader as they use them a lot and the plugs can get bad or your pin in your STI connector might have been oxidized.
When you turn on the key with out starting the engine does your fuel pump run for one second and stop or does it keep running all the time?
If you can not read codes and the fuel pump runs all the time then more than likely you have a bad PCM Computer.
I will not comment on why the Ford technicians do what they do at this time.
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I'll check on how much the fuel pump runs-I never really noticed. As far as I can remember the idle air control valve has never been touched.
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The fuel pump does run for just a few seconds. I followed the instructions from Fordfuelinjection.com for getting the codes, and got the following: first, a flickering of the light, as expected. Then it flashes 1, then 2 times, pauses, flashes 6 and 3, pause, flashes 3 and 4, pause, 5 and 3, then flashes 9 times and pauses. There is then a repeat of the 12, 63, 34, 53 and 9, then another pause. It then flashes 11,11 pause, 11, 11. I ran through this multiple times to confirm the readings. If I understand the Fordfuelinjection.com information correctly, the flickering light is running through the codes for the code readers, and the 11-11 reading means no CM codes. I hope you guys can help me interpret what this means and what I need to test or replace. Thanks in advance for any help you can offer.
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OK, I rechecked this and got exactly the same thing. I ground the single wire, sit down and turn on the key with the engine off. I get a flickering flash, then a pause. Then one flash, a short pause and two flashes. Then a short pause, six flashes and a pause, three flashes and a longer pause, then three flashes and pause, four flashes, longer pause, five flashes, pause, three flashes and a longer pause, then nine flashes in a row. I cleared the thing out, and will drive it again and see if the light comes back on and recount.
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From: Bonita Springs FL
The site subford referred you to earlier will explain how to interpret the flashes into numbers. We really need the numbers, not the flash-pause version.
Also was the engine running or off?
Also was the engine running or off?
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The engine was off. I cleared the codes, then drove around about 10 miles and rechecked the codes. I am told to read the numbers by how many times it flashes in a sequence, then when it pauses for a half second to start counting for the next number. The numbers are 12, 63, 34, 53, and 9. This is a 94 Motor home, but might have been built on a 93 or 95 chassis-will that make a difference?
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From: Easton,Ks
It would be a 1993 E350 and looks like it would have a two number code.
But as I said above and you more than likely have checked at: http://fordfuelinjection.com/?p=13
For your setup there is not a code 12 or 9 and 63 says TPS below Min. Voltage and 53 says TPS above Max. Voltage.
You can not have both.
The 34 could be EVR but do not think this is a good code with the engine off.
I am starting to lean towards a bad PCM.
But as I said above and you more than likely have checked at: http://fordfuelinjection.com/?p=13
For your setup there is not a code 12 or 9 and 63 says TPS below Min. Voltage and 53 says TPS above Max. Voltage.
You can not have both.
The 34 could be EVR but do not think this is a good code with the engine off.
I am starting to lean towards a bad PCM.