1994 E-150 skipping

[Dave Abrahamson]

The van I drive for work has been skipping and jerking while driving. It only does this after it warms up a few minutes. It doesn't do it under hard acceleration, but when I am up to speed and my foot is barely on the accelerator. Also it hiccups while idling too. Almost like someone is intermittently shutting off the ignition. So far this is what I have done: New plugs, New cap and rotor, new plug wires. Still skips. Could this be fuel related? Like a filter or bad injectors? Can an ignition module go bad like this? Inline 6, 4.9 EFI<br />Sorry for the longish post, but I wanted to make myself clear. Hope I did.<br />Thanks for any and all replies.<br /><br />Dave

 

[scrapper]

Re: 1994 E-150 skipping

just a thought it happened to me turns out it was the throttle positioning sensor ,after we changed fuel reg, fuel pump, filter, oxegen senser,and coil pack this is what come up possibilties on dianostic machine at local garage wouldnt you know it was the last thing we changed that was the culprit . please excuse spelling

 

[dogsdad]

Re: 1994 E-150 skipping

Sure sounds like an EGR Valve to me. If it opens too easily, it may cause symptoms just like that.

 

[Dave Abrahamson]

Re: 1994 E-150 skipping

Thanks for the suggestions guys, I guess maybe I should get it on a diagnostic machine . I liked my old '81 F-150 inline 6 better. Much easier to work on. I can barely get to anything with this van. Glad it's not a V8

 

[Dave Abrahamson]

Re: 1994 E-150 skipping

OK, so far new plugs, wires, cap, rotor and coil. Still hiccups. When I took the vacuum line off the EGR valve it seemed better, but did not go away completely. It seems to be knocking and pinging more now also. I coulda sworn this was an ignition problem but....<br />Could it be a fuel problem? Filter? O2 sensor? MAP sensor? Bad EGR?

 

[Bondo]

Re: 1994 E-150 skipping

I guess maybe I should get it on a diagnostic machine

Ayuh,....................<br /><br />Or,.......<br /><br />You can Just Keep Throwing Parts At It,.........You're bound to get Lucky,...... Sooner or Later........ <br /><br /><br />I'm Sorry I Can't Help ya Dave,.............<br /><br />As you know,..... Seat of the Pants Diagnosis is Long Dead, with the Computer Controlled motors nowadays..........<br /><br />I'm Pretty Lucky,..... I've got a close Bud, who has the Snap-On Diagnostic Computer,.. With the lastest software.... <br />Saves me Abunch of Money,.... Not having to own Another Tool, that I wouldn't use often enough........

 

[frroog000]

Re: 1994 E-150 skipping

Hey if its fuel injected I would check the gas cap. A lot of people don't realize that its a pressized system

 

[dolluper]

Re: 1994 E-150 skipping

Take the wooden end of a hammer and knock on the block beside the KNOCK SENSOR vehicle running<br />if the engine speed increases it is woorking ,if not replace.Also check your Mass AIR FLOW sensor on air breather intake ,tap it with same hammer or other one engine should stumble then recover if no change replace

 

[KRS]

Re: 1994 E-150 skipping

I knew dolluper would have an idea.

 

[dolluper]

Re: 1994 E-150 skipping

Yeah but there's still plenty more waiting to hear the results of these tests first Diffinatly needs a fuel pressure test also.

 

[Chief101]

Re: 1994 E-150 skipping

Originally posted by Bondo:<br />

I guess maybe I should get it on a diagnostic machine

Ayuh,....................<br /><br />Or,.......<br /><br />You can Just Keep Throwing Parts At It,.........You're bound to get Lucky,...... Sooner or Later........ <br /><br /><br />I'm Sorry I Can't Help ya Dave,.............<br /><br />As you know,..... Seat of the Pants Diagnosis is Long Dead, with the Computer Controlled motors nowadays..........<br /><br />I'm Pretty Lucky,..... I've got a close Bud, who has the Snap-On Diagnostic Computer,.. With the lastest software.... <br />Saves me Abunch of Money,.... Not having to own Another Tool, that I wouldn't use often enough........

so Bondo, what's wrong with getting lucky, keeps the economy going, and if you can get paid by the hour for such, I say, do it. You should be able to get codes should you not?

 

[Dave Abrahamson]

Re: 1994 E-150 skipping

Thanks for the suggestions Dolluper, will do exactly as you said and report back. It's a work truck so the Co. is picking up the tab for whatever I want to do. (and I like fiddling with stuff) I don't mind throwing parts at it as they needed replacement soon anyway I would guess. (157,000 on original parts) Sure is frustrating though...I miss carbs and points......<br /><br />BTW where on the block is the knock sensor?<br /><br />Thanks SOOOOOOO much for helping me out

 

[dolluper]

Re: 1994 E-150 skipping

In the middle between 3 + 4 cylinders under exhaust manifold