Running rough @ highway speed
Thread Starter
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Senior User
Joined: Jan 2003
Posts: 208
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From: Wyoming, Ontario
Running rough @ highway speed
1987 Ranger 2.9L 2wd 283,000km (175,000mi)
When I drive at speeds of 90kph (55mph) or more, my truck will begin to run rough, loose speed and blow black smoke from the exaust for periods of 10-30 seconds at a time.
This first happened to me while driving home from Ottawa (7hrs away) after having to change my transmission.
I read the codes and got:
33 - EGR Valve fault / not closing properly
and
29 - Insufficient input from the Vehicle Speed Sensor
Any help/advice would be greatly appreciated!
When I drive at speeds of 90kph (55mph) or more, my truck will begin to run rough, loose speed and blow black smoke from the exaust for periods of 10-30 seconds at a time.
This first happened to me while driving home from Ottawa (7hrs away) after having to change my transmission.
I read the codes and got:
33 - EGR Valve fault / not closing properly
and
29 - Insufficient input from the Vehicle Speed Sensor
Any help/advice would be greatly appreciated!
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
Running rough @ highway speed
Have you run the pinpoint tests for the codes? If you don't have them I could scan them from my 1988 Ford manual and email them to you. Also make sure the fuel pressure regulator isn't leaking.
Thread Starter
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Senior User
Joined: Jan 2003
Posts: 208
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From: Wyoming, Ontario
Running rough @ highway speed
Update:
I found the vehicle speed sensor disconnected, so I plugged the harness back in. This has not solved my problem.
I did the Key-On-Engine-Running test tonight and got a new code in addition to #33:
41 - HEGO (H20S) sensor voltage low / system lean
Is that the oxygen sensor? It may have been banged around when the transmission was being changed out, and it got wet too. The y-pipe that holds the sensor was full of water when we went to put it back on, because it rained a lot while I was in Ottawa.
How do I do this?
I found the vehicle speed sensor disconnected, so I plugged the harness back in. This has not solved my problem.
I did the Key-On-Engine-Running test tonight and got a new code in addition to #33:
41 - HEGO (H20S) sensor voltage low / system lean
Is that the oxygen sensor? It may have been banged around when the transmission was being changed out, and it got wet too. The y-pipe that holds the sensor was full of water when we went to put it back on, because it rained a lot while I was in Ottawa.
Have you run the pinpoint tests for the codes?
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
Running rough @ highway speed
Check the wiring, it is very common for it to get burned or pinched between the tranny & block. Yes its the oxygen sensor.
Pinpoint tests are used to determine the exact cause of a code, if you need it let me know.
Pinpoint tests are used to determine the exact cause of a code, if you need it let me know.
Thread Starter
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Senior User
Joined: Jan 2003
Posts: 208
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From: Wyoming, Ontario
Running rough @ highway speed
We replaced the oxygen sensor and the code is gone now. I'm still having the problem though. In fact, it is a lot worse now. The truck has got an appointment at our local dealer tomorrow. Hopefully it won't cost me too much!
Post Fiend
Joined: Mar 2003
Posts: 14,413
Likes: 3
From: Sarnia, Ontario, CANADA!
Running rough @ highway speed
It's 6:15 and you are home from work already?!?! And you have an appointment tomorrow? That means you are taking the day off?!?! I would highly suspect your main supervisor is gone from work and you are slacking it up!! Anyways, good luck on your truck and hopefully it doesn't cost too much! There's no place like to "stealership" to spend your paycheck!!
-Matt
-Matt
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Thread Starter
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Senior User
Joined: Jan 2003
Posts: 208
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From: Wyoming, Ontario
Running rough @ highway speed
Well I don't know any more!
I've replaced the O2 Sensor, fixed the speed sensor, cleaned the IAC, replaced the MAP sensor and had the coolant temp sensor replaced. The dealer even checked the fuel pressure regulator for me and said it's fine and there is nothing wrong with the fuel pressure. Each time I do something, the truck runs fine long enough for me to think it's finally fixed, and then oh, look! it's doing it again.
The only code left is the one about the EGR valve. It has not been connected to the manifold since I got the truck, so I don't think that it would have just started causing trouble now.
- Tim
I've replaced the O2 Sensor, fixed the speed sensor, cleaned the IAC, replaced the MAP sensor and had the coolant temp sensor replaced. The dealer even checked the fuel pressure regulator for me and said it's fine and there is nothing wrong with the fuel pressure. Each time I do something, the truck runs fine long enough for me to think it's finally fixed, and then oh, look! it's doing it again.
The only code left is the one about the EGR valve. It has not been connected to the manifold since I got the truck, so I don't think that it would have just started causing trouble now.
- Tim
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Post Fiend
Joined: Mar 2003
Posts: 14,413
Likes: 3
From: Sarnia, Ontario, CANADA!
Running rough @ highway speed
This guy with the problems is my friend so I know what he is gonna ask. He is gonna say "What the heck is a FPR??" LOL! Seriously! I don't know even know so can you tell me what it is. I know he just got all brand new exhaust from (and including) his catalytic convertor back so that couldn't be his problem unless when they replaced the tranny they didn't put it back on properly! MMmmmm? 
Thanks Ken!
-Matt
Thanks Ken!-Matt
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
Running rough @ highway speed
Fuel pressure regulator.
You need to pull the vacuum line off and see if there is gas in it.
An exhaust leak from the heads back can cause a false lean reading from the O2.
I'm still worried about the O2 wires since the tranny was just done.
You need to pull the vacuum line off and see if there is gas in it.
An exhaust leak from the heads back can cause a false lean reading from the O2.
I'm still worried about the O2 wires since the tranny was just done.
Last edited by Ken00; Aug 22, 2003 at 07:17 PM.
Thread Starter
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Senior User
Joined: Jan 2003
Posts: 208
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From: Wyoming, Ontario
Running rough @ highway speed
While I was at work, I had my dad look at everything that you had mentioned. He found nothing wrong.
No gas in the vacuum line on the FPR.
No exaust leaks
and the wires to the O2 sensor looked fine, no visible damage due to pinching, burning, etc.
To top it all off, the truck has been running great for the past 2 days now! It was causing trouble one night after I filled up with gas, the next day it ran fine. When I fill it up again, I will see if it is still using too much gas, but until then everything seems to be working fine. Hopefully it will stay that way.
Beast12: This supports our theory of Fords fixing themselves!
- Tim
No gas in the vacuum line on the FPR.
No exaust leaks
and the wires to the O2 sensor looked fine, no visible damage due to pinching, burning, etc.
To top it all off, the truck has been running great for the past 2 days now! It was causing trouble one night after I filled up with gas, the next day it ran fine. When I fill it up again, I will see if it is still using too much gas, but until then everything seems to be working fine. Hopefully it will stay that way.
Beast12: This supports our theory of Fords fixing themselves!
- Tim
Good luck on your truck man!
Thread Starter
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Senior User
Joined: Jan 2003
Posts: 208
Likes: 0
From: Wyoming, Ontario
Running rough @ highway speed
Well, it's been almost a week since I had any problems. I still have no idea what caused my trouble, but everything seems to be back to normal.
I did have a fuel filter that was rusted out so bad that it started leaking through a rust hole, but that's the only trouble I've had since my last post.
- Tim
I did have a fuel filter that was rusted out so bad that it started leaking through a rust hole, but that's the only trouble I've had since my last post.
- Tim