Wits End Here
Posting Guru
Joined: Sep 2006
Posts: 1,515
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From: Jasper, MO
My mechanic here, the guy that I use for everything I either can't or am too lazy to do, says to rebuild my 351W in my van would be about 1250. That's hardly more than the INSTALL you mentioned, lol. And while you may be thinking a different rebuilt engine will solve your woes, just remember EVERY rebuilt engine was rebuilt for a reason. At least with THIS one you KNOW where it's been. food for thought.
Cargo Master
Joined: Dec 2003
Posts: 2,182
Likes: 7
From: Saint Augustine, FL
Originally Posted by Ghoti
Am I missing something? If it runs good, (no miss) I assume, in park, and only misfires while driving, wouldn't it be the speed sensor, or some similar output device?
Steve
'95 Clubwagon XLT
Freshman User
Joined: Apr 2006
Posts: 30
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Originally Posted by Clubwagon
No. There are plenty of misses that only occure under load. Bad plug wires are famous for that.
Steve
'95 Clubwagon XLT
Steve
'95 Clubwagon XLT
Posting Guru
Joined: Sep 2006
Posts: 1,515
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From: Jasper, MO
Actually, There are. Since the late-model improvements in electronic ignition, many of these motors are more than capable of producing a "miss" that only presents itself under certain conditions and some harmonic rhythms. At an idle, the electronics easily compensate for the miss. but within a certain rpm range, the miss will appear and then cycle out with increased speed. That being said, however, I DO tend to agree with Ghoti on the speed sensor, especially with all the probems FORD had been having with that device.
Freshman User
Joined: Apr 2006
Posts: 30
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Originally Posted by Clubwagon
It absolutely will. ABSOLUTELY.
Steve
'95 Clubwagon XLT
Steve
'95 Clubwagon XLT
I would disagree. ABSOLUTELY.
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Joe Kucinski
Posting Guru
Joined: Sep 2006
Posts: 1,515
Likes: 0
From: Jasper, MO
I've had it happen. On many different vehicles and makes. ABSOLUTELY. On older vehicles, broken advance springs alone would do it. TPS would do it. Speed sensor would do it. GM HEIs do it. Carbon Tracking. Crossfire. absolutely.
Cargo Master
Joined: Dec 2003
Posts: 2,182
Likes: 7
From: Saint Augustine, FL
Originally Posted by Ghoti
Are you saying that a load induced miss will go away at certain speed range as you accelerate from 0-60? Say no miss from 0-30, 35-45 missing, 50 -60 runs fine.
I would disagree. ABSOLUTELY.
I would disagree. ABSOLUTELY.
I had two or three cars/trucks through my shop a week with this condition as it is often miss-diagnosed by general repair shops as a transmission problem. I sent lots of these back to the referring shop for tune-ups.
Steve
'95 Clubwagon XLT
Freshman User
Joined: Apr 2006
Posts: 30
Likes: 0
Originally Posted by Clubwagon
No. A _VERY_ common load induced missfire is under light acceleration at speeds of 40+ mph. The condition is: the transmission in overdrive with the torque converter clutch applied. In this situation, a high resistance plugwire, coupled with a cap/rotor and plugs in poor condition will cause a missfire. Ease up on the throttle and it goes away. Apply more thottle and the converter clutch dis-engages and it goes away.
I had two or three cars/trucks through my shop a week with this condition as it is often miss-diagnosed by general repair shops as a transmission problem. I sent lots of these back to the referring shop for tune-ups.
Steve
'95 Clubwagon XLT
I had two or three cars/trucks through my shop a week with this condition as it is often miss-diagnosed by general repair shops as a transmission problem. I sent lots of these back to the referring shop for tune-ups.
Steve
'95 Clubwagon XLT
Junior User
Joined: Sep 2006
Posts: 86
Likes: 0
The very first thing I would do is get the heck away from the shop you took it to and find someone that doesn't want to just throw parts at it. I am assuming there is a CEL with this condition. If so there are codes involved. These codes don't tell you what is wrong, they tell you what is being affected by the problem. There is a specific diagnostic tree that must be followed, and dealerships are notorious for just throwing YOUR money at a problem.