erased codes.problem still there but now no codes?
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Lead Driver
Joined: Apr 2001
Posts: 6,335
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From: Midwest
erased codes.problem still there but now no codes?
I will try to make this as brief as possible. this is for my 95 f150 5.0 4wd. earlier in the week i posted this thread https://www.ford-trucks.com/forums/7...-not-sure.html
today I went out and erased the codes and took the truck for a drive(didn't think the problem would be gone,just wondered if the computer would activate them again). now I have no codes and the truck is still running the same. So I guess my question is this: If my problem was the TPS like the codes originally said,wouldn't the computer have the code 122 in it again? I am just trying to figure this out before I spend the money on a new TPS and then still have the same problem. the truck will rev just fine when in park,but it skips/misses under load when driving. thanks again for the help!!
today I went out and erased the codes and took the truck for a drive(didn't think the problem would be gone,just wondered if the computer would activate them again). now I have no codes and the truck is still running the same. So I guess my question is this: If my problem was the TPS like the codes originally said,wouldn't the computer have the code 122 in it again? I am just trying to figure this out before I spend the money on a new TPS and then still have the same problem. the truck will rev just fine when in park,but it skips/misses under load when driving. thanks again for the help!!
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
The 122 you got was in CM, right.
So it did not come from the voltage test in the KOEO test.
So back probing will not do you much good.
So you have to do the vibration tests and the wiring shakes.
You may have got the 122 when you hit a big bump and that is why you have to tap on the sensor and shake the wiring while testing. This problem may be hard to find and the TPS is more then likely OK.
That is why I gave the instructions for the CONTINUOUS MONITOR (WIGGLE TEST MODE) test.
If you got the 122 during the KOEO voltage test then it did not pass the voltage test and back probing is in order.
So it did not come from the voltage test in the KOEO test.
So back probing will not do you much good.
So you have to do the vibration tests and the wiring shakes.
You may have got the 122 when you hit a big bump and that is why you have to tap on the sensor and shake the wiring while testing. This problem may be hard to find and the TPS is more then likely OK.
That is why I gave the instructions for the CONTINUOUS MONITOR (WIGGLE TEST MODE) test.
If you got the 122 during the KOEO voltage test then it did not pass the voltage test and back probing is in order.
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Lead Driver
Joined: Apr 2001
Posts: 6,335
Likes: 6
From: Midwest
Ok,it couldn't be as simple as the TPS. I tested it,it tested ok. What else would cause a miss/stutter under load? all ignition parts are less than a month old. plugs,wires,dist cap,rotor all new. like i said in my other post,the truck ran GREAT for 3 days after I installed the headers,but now has the miss/stutter under load from 2,000-3500 rpm and clears up after that. thanks for any help!!
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Lead Driver
Joined: Apr 2001
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Likes: 6
From: Midwest
Bill,yes there was a separation if I recall correctly. there was a 10 before the 122 code. what does that mean? I know it is a continuous memory code,but does it mean the tps could be flaky and just tested good when i tested it?
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Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
It means the TPS is more than likely good and you need to read the post above (post #3) where I wrote about the 122 CM code.
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Lead Driver
Joined: Apr 2001
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From: Midwest
I did read your post #3(good info by the way!!) and i did those steps for the continuous monitor test using the CEL light,and I couldn't get the CEL to come on by moving the throttle or wiggling the wires and tapping the tps,and it didn't come on when i moved the throttle open and closed slowly.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
I did read your post #3(good info by the way!!) and i did those steps for the continuous monitor test using the CEL light,and I couldn't get the CEL to come on by moving the throttle or wiggling the wires and tapping the tps,and it didn't come on when i moved the throttle open and closed slowly.
I was thinking that it might be a shutter instead of a miss. Maybe transmission or drive line.
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Lead Driver
Joined: Apr 2001
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From: Midwest
I just cleared the codes and drove it on a couple errands and ran the codes when I got back,the tps code 122 had returned. it is more of a skip/miss/stutter than a shutter or vibration. the tach jumps wildly in a 500 rpm range when it is doing it. I put the truck in neutral and revved it up to 4,000 rpms and it accelerated just fine,without sputtering or missing. I am not sure if it is the tps,just wondering why that code keeps returning when the tests I did said the tps was fine.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
About the only way is to replace the TPS and see if it comes back.
If it does come back then it is the plug at the TPS or the wiring and plugs from the TPS to the computer or the computer plug its self may have a bad pin.
I guess you all ready knew all of this.
If it does come back then it is the plug at the TPS or the wiring and plugs from the TPS to the computer or the computer plug its self may have a bad pin.
I guess you all ready knew all of this.
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Lead Driver
Joined: Apr 2001
Posts: 6,335
Likes: 6
From: Midwest
Maybe I will just replace the tps,not that expensive and if it is anything like the rest of the parts on the engine,it is original at 155,000 miles. at least that should take it out of the equation here. i will post my results,but it might be a week or so. I am thinking I will get a motorcraft one instead of one from the local parts stores.
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Lead Driver
Joined: Apr 2001
Posts: 6,335
Likes: 6
From: Midwest
replaced the tps this morning,no change in the way the truck runs. I also checked fuel pressure,and it is good at idle and when I rev the truck in park,but no way to check it under load where the engine is skipping/missing. any other ideas?
