Surging, stalling and more. ???
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Surging, stalling and more. ???
I let my wife use my work van (her B2 died) and at first I suspected bad gas or ethanol.
It would surge and surge and then die eventually.
I popped the doghouse and found a couple cracked vac lines, fixed them and no change.
The last few days it got worse. Now it won't start unless I put my foot on the throttle a bit and then it still catches and revs a bit then dies and if you hold the throttle part open it keeps doing the run, die, run, die.... If I can get it in gear, then I can take off and get some power but it is still stumbling occasionally.
I swapped an IAC from a '95 5.8 in the weeds (looked close, plug matched) and it made no difference.
I put a MAP (?the stand alone thing w 3 wires and a vac line?) from my diesel (there were numbers that matched, plug matched) and then it wouldn't start at all no matter what I did w the throttle.
I put a used fuel pump in a couple years ago. ???
The check engine light has always gone on after a block or two as soon as ya gotta give it some gas, and then stays on forever as you drive.
Iread a post below about vac leaks in the evap lines and going out to look at that.
Sound familiar?
Any guesses?
'95 E-250 4.9 six auto ac-disconnected
THANKS!!!
It would surge and surge and then die eventually.
I popped the doghouse and found a couple cracked vac lines, fixed them and no change.
The last few days it got worse. Now it won't start unless I put my foot on the throttle a bit and then it still catches and revs a bit then dies and if you hold the throttle part open it keeps doing the run, die, run, die.... If I can get it in gear, then I can take off and get some power but it is still stumbling occasionally.
I swapped an IAC from a '95 5.8 in the weeds (looked close, plug matched) and it made no difference.
I put a MAP (?the stand alone thing w 3 wires and a vac line?) from my diesel (there were numbers that matched, plug matched) and then it wouldn't start at all no matter what I did w the throttle.
I put a used fuel pump in a couple years ago. ???
The check engine light has always gone on after a block or two as soon as ya gotta give it some gas, and then stays on forever as you drive.
Iread a post below about vac leaks in the evap lines and going out to look at that.
Sound familiar?
Any guesses?
'95 E-250 4.9 six auto ac-disconnected
THANKS!!!
Last edited by Bobcat7; Jul 19, 2011 at 05:10 PM. Reason: Missed info
Posting Guru
Joined: May 2007
Posts: 1,208
Likes: 2
From: North Reading Mass
Your system should be OBD1 and most stores can't pull those codes. Go to fordfuelinjction.com for info on pulling the codes with a paper clip. Other sites have the info and code breakdown too. While the EFI is complicated it can be easily checked with a Haynes manual and a multimeter. Don't replace any component with out testing it first. On my past 3 4.9s the only issues have been the MAP sensor, loose connections, and leaking vac lines. Other trucks I have worked on have had faulty TPS, IAT, PIP, and IAC.
regards
rikard
regards
rikard
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Thanks for the info. I went to fordfuelinjection.com and printed the codes and instructions. I have a buddy that owns a small service station and I have worked on his rentals etc and thought I could get the code read there - way too busy. Thanks. When it's his stuff it's real important but if it's just the vehicle that I depend on for my whole business then - no big deal. He was going to change the iac before he even pulled the codes.
But... had a friend of a friend pull codes and bingo!
126 Map or baro out of range - went to the '89 bronco in the weeds and stole the map and it runs like a top. How simple. Hard to believe that such a common map - one thats in stuff from the 70's thru late 90's could cost 100 bucks at the parts store.
I forgot to mention that I am in the boonies and the local parts places don't scan and must think that no-one can get the internet here to order parts online.
Thanks for the help - I am going to keep that info handy.
But... had a friend of a friend pull codes and bingo!
126 Map or baro out of range - went to the '89 bronco in the weeds and stole the map and it runs like a top. How simple. Hard to believe that such a common map - one thats in stuff from the 70's thru late 90's could cost 100 bucks at the parts store.
I forgot to mention that I am in the boonies and the local parts places don't scan and must think that no-one can get the internet here to order parts online.
Thanks for the help - I am going to keep that info handy.
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