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  #1  
Old 07-28-2012, 02:11 PM
Starfish Farms Starfish Farms is offline
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Default 5.9 Apparent Fuel Problem '99

Have tried several fixes for my 1999 Dodge Ram 2500 5.9L w/200,000 mi. & rebuilt tranny. Don't do my own work, but FT mechanic has worked on my farm & family's vehicles for me for yrs. He's stumped. I'm frustrated

Started with code of misfire 2 cyl. Did plugs, wires, cap. OK for about a week, it seemed - lite came back on - found vac hose off. Ran better, then code - misfire diff cyl. Did compression test. All OK. Did O2 sensor & crank sensor. Nope. Code for intake - Checked. Fuel pressure OK. At one point he had me pick up & add some engine additive. (He added it.) Cat Conv replaced @ a year ago.

Using tons of fuel, feel resistance accelerating, and with constant pressure on the pedal speeds up and slows down. Pulling a hill sometimes I have to floor it. Twice dieseled on shutting it off, then cranks longer than usual starting up.

This morning someone told me he had a '98 w/similar symptoms & mechanic found pin hole in 90 deg. bend in metal fuel line(?) I asked my mechanic & he said would have shown in fuel pressure test.

Does anyone have any ideas - anything to try? TIA.
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Old 07-28-2012, 11:49 PM
Screamintrashcan Screamintrashcan is offline
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Look down through your throttle plates while holding them open, using a flashlight, and see if theres any oil residue in the intake. sure fire indication of the gasket sucked loose on the bottom of the intake manifold. pretty common problem, associated with detonation, misfires, dieseling, and a few other maladies. yeah, the manifold has to come off and be flipped upside down to replace it. I personally do not appreciate the reason for building the manifold this way, there must have been SOME reason to have put, basically, an oil pan on the bottom of the intake manifold... Weird. My best guess, anyhow. Good Luck!
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Old 07-29-2012, 09:52 AM
Starfish Farms Starfish Farms is offline
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Default Interesting!

Hey - thanks so much for this. Should I assume that if the oil pan and gasket were replaced just prior to this, could have precipitated it?

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Originally Posted by Screamintrashcan View Post
Look down through your throttle plates while holding them open, using a flashlight, and see if theres any oil residue in the intake. sure fire indication of the gasket sucked loose on the bottom of the intake manifold. pretty common problem, associated with detonation, misfires, dieseling, and a few other maladies. yeah, the manifold has to come off and be flipped upside down to replace it. I personally do not appreciate the reason for building the manifold this way, there must have been SOME reason to have put, basically, an oil pan on the bottom of the intake manifold... Weird. My best guess, anyhow. Good Luck!
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Old 07-29-2012, 10:34 AM
Screamintrashcan Screamintrashcan is offline
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I think the gasket on the tin plate on the bottom of the intake manifold kinda has a service life, it lives in a pretty harsh environment. gasket hardens, shrinks, cracks, whatever. some people have reported that they've broken off some of the bolts holding the manifold onto the heads, I've always had good luck removing these type of weak bolts with a small, 3/8 impact, the jarring seems to help break them loose vs simply twisting them. First, though, verify that theres oily residue inside the intake, if there isn't, it's something else. The fuel pressure must be consistant, so unless you've observed a gauge stuck under a wiper while driving it around, and have verified that pressure is steady as a rock while the eng is being a bad actor, don't count out a fuel pump. There isn't a fuel filter, so don't bother looking for one, unless someone added it after initial purchase.35-40 are the numbers most associated with the pump, steady is the key tho, cuz the ecu compensates for fuel pressure variances, it seems.
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Old 07-29-2012, 10:55 AM
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Default

The dieseling is usually unburned fuel detonation in the cylinders caused from the heat of the engine.

It could be a timing issue, but that's controlled by the ECM, so you may be able to rule it out, or check for similar (or other) issues that might indicate a malfunction in the ECM.

Is the pickup in the distributor okay and is the pick-up seated properly, not cracked, etc...

There is a potential for the pickup to cause a misfire. Simple fix for a contortionist little more time consuming for regular people. Just have to remove the cap and rotor.

I second STC's advise above about the plenum pan gasket. Check that out before you change anything unnecessary.

These things are finicky and they more often take more time than money, but if it is an electronic issue related to the unburned fuel (misfire/weak spark/intermittent fire) theres my suggestion.
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Old 07-31-2012, 09:53 PM
zachcroft zachcroft is offline
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i had all the symptoms you do. even replaced some of the stuff you did. then i replaced the idle air control valve solenoid on my truck and it seems to be working fine. i had also noticed the lack of power on my truck. i did however have 1 symptom that you didn't have. it sounded like my truck was "backfiring" under the hood.
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Old 08-02-2012, 03:22 AM
Gen1dak Gen1dak is offline
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Intake belly pan gasket. The design is crap. Resulted as a consequence of making a 2-piece intake.
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