Help ! Intermittent starting 1993 B2600i 4x4

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Help ! Intermittent starting 1993 B2600i 4x4

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Help ! Intermittent starting 1993 B2600i 4x4 - 5/5/2008 7:31:14 AM

Dave P

Posts: 12
Joined: 5/5/2008
Status: offline

I never had a starting problem until one day the nightmare began . It would crank well but would not ignite. Somedays it would start. Once started , if I didn't pay attention , the RPM's would steadily drop and die out and would not restart. If I paid attention and kept the rpm's up by pressing the accelerator I would be fine and would not have a problem starting all day. The next day would be iffy all over again. Somedays I would be successful some not. It has been sitting for several days now and I can't get it started. Over this period I checked and replaced several items: (1) ignition -replaced distributor cap , rotor , wires and plugs - good spark from all wires and coil. (2) fuel delivery- checked fuel filter 30psi to filter and 39psi after filter. I replaced it anyhow. I pulled hose off fuel pressure regulator and no fuel dripped out. Yesterday after trying to start the truck i pressed on the accelerator then put it to the floor to drain off fuel-it seemed to want to ignite. I took out the plugs and they had fuel on them. Is my problem due to ignition system or a fuel delivery or something else ? Is the psi's quoted sufficient ? If I get gas on my plugs does this eliminate fuel pump problems ? Can this be a mass air flow problem or a fuel relay?
I need help ! Thanks Dave P

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Dave P

Post #: 1

RE: Help ! Intermittent starting 1993 B2600i 4x4 - 5/9/2008 5:35:50 AM

bigboss2010

Posts: 65
Joined: 12/19/2007
Status: offline

Could be a MAF problem or it could just be a ECM problem, if you discover it is your ECM try AvPro ECM to have it repaired.

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Big Boss
My Cardomain Site

(in reply to Dave P)

Post #: 2

RE: Help ! Intermittent starting 1993 B2600i 4x4 - 5/15/2008 1:42:34 PM

Dave P

Posts: 12
Joined: 5/5/2008
Status: offline

Bout 5-7 days ago I put in a new oxygen sensor- has started ever since with no problems.
Noticed almost no exhaust smoke, engine idles more smoothly.I'm happy I didn't have to pop for
a MAF sensor ( $ 299 ) or the labor for a new fuel pump - Now for the new pitman arm and I hope that's all.

(in reply to bigboss2010)

Post #: 3

RE: Help ! Intermittent starting 1993 B2600i 4x4 - 5/16/2008 1:28:39 PM

mxer201

Posts: 29
Joined: 2/9/2007
Status: offline

quote:

ORIGINAL: Dave P

Bout 5-7 days ago I put in a new oxygen sensor- has started ever since with no problems.
Noticed almost no exhaust smoke, engine idles more smoothly.I'm happy I didn't have to pop for
a MAF sensor ( $ 299 ) or the labor for a new fuel pump - Now for the new pitman arm and I hope that's all.

I don't understand how an O2 sensor would make such a big difference. Once when mine was idling, I unplugged the sensor just to see what would happen. Didn't change the idle one bit!!

(in reply to Dave P)

Post #: 4

RE: Help ! Intermittent starting 1993 B2600i 4x4 - 5/26/2008 7:08:39 PM

Dave P

Posts: 12
Joined: 5/5/2008
Status: offline

Mxer201 You were right- OS2 seemed to work....for awhile... or I imagined the engine idled more evenly and there was no visible exhaust. Soon after the revs did fluctuate wildly. I think I'll have to take bigboss2010 advice and check out the ECM. I've read that the capacitors have a tendency to leak over a period of time and I now recall a faint odd odor before all these problems. Since this is an older vehicle these items would have needed replacing sooner than later. Now if only I didn't hastily pull the gas tank to replace the pump......damn

(in reply to mxer201)

Post #: 5

RE: Help ! Intermittent starting 1993 B2600i 4x4 - 5/27/2008 9:58:46 AM

mxer201

Posts: 29
Joined: 2/9/2007
Status: offline

If you go the ecm route check this guy. He repaired mine in 04. So far no problems. Good luck.

http://www.avproecm.com/

(in reply to Dave P)

Post #: 6