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Old 04-10-2012, 11:45 AM
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stumped on an idling problem, 2.5

Hey guys. I'm at my wits' end. '93 2.5, engine idles down to 250-350 on occaision, even trying to die. Also, while accelerating through 1rst, 2nd, 3rd she boggs badly- but not all the time. Sometimes she runs perfectly fine. Sometimes she runs horribly, it just alternates between starts.

New IAC, TPS, plugs, wires, vac lines, battery, intake/exhaust gaskets, e-fan, valve & oil pan gaskets, dist. cap/rotor/gasket.

All vacuum lines are new, sprayed and checked well, no leaks. at idle the fuel pressure on the rail shows 35, 45 with the pressure regulator vacuum unplugged.

If it was the crank sensor, you'd think the problem would stay the same so I don't think that's the problem.

I am, however, concerned about timing. is it possible that the ecm is being confused, because the dist may be off a few teeth?

Thank you for your help

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Old 04-10-2012, 11:57 AM   #2
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Could be a clogged cat ?, if yours is still on.

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Old 04-10-2012, 02:06 PM   #3
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Check to see if your exhaust system is plugged. Do you have any exhaust leaks before the O2 sensor? Is your fuel filter new? Did you clean out your injectors with fuel injector cleaner?

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Could be a clogged cat ?, if yours is still on.
I know you're not suggestion breaking Federally Mandated laws by suggesting he remove his catalytic converter... Which is also highly frowned upon on this forum. Easiest way to get a thread closed
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Old 04-10-2012, 02:11 PM   #4
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the dist shouldn't be off unless you pulled it out

35 on the rail seems low, did you try a new fuel filter

it could also be the fuel pump going or the wiring to it
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Old 04-10-2012, 07:49 PM   #5
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Quote:
Originally Posted by Xpress
Check to see if your exhaust system is plugged. Do you have any exhaust leaks before the O2 sensor? Is your fuel filter new? Did you clean out your injectors with fuel injector cleaner?

I know you're not suggestion breaking Federally Mandated laws by suggesting he remove his catalytic converter... Which is also highly frowned upon on this forum. Easiest way to get a thread closed
With all due respect, I did not suggest any such thing, I simply made an observation about the symptoms he was experiencing.
It has the classic signs of a clogged catalytic converter , UNLESS he doesn't have one , if so , that probably isn't what's causing his problems .👍
If they do become clogged or go bad, they CAN be replaced. 😄
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Old 04-10-2012, 09:47 PM
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Lol Boys, no cat- this is arkansas anyway. Tree huggers not allowed.

New fuel filter, no leaks before o2 sensor.

Had dist out because of the old gasket leaking.

Book calls for 35 at the fuel rail.

Still stumped.

Timing, maybe?
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Old 04-10-2012, 09:51 PM   #7
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Again, a catalytic converter is Federally mandated on modern vehicles sold in the USA. I'm not saying you removed it, but don't go around telling people you don't have one. The last thing you want is people with a lot more authority snooping around and ticketing you up the tail pipe from a bunch of plant eaters rating you out..

FWIW I'm no tree hugger. If I was I'd own a Prius based upon mis-conceptions that it's "cleaner"

-------------

I'd check the timing, although it's computer controlled. I believe it needs to be at 8* (but since you have MPFI it might be different). Otherwise I would go back through and check for vacuum leaks.

One more thing, does your brake booster sound like air is being pumped out when you push on it repeatedly? Your brake booster might be bad..

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With all due respect, I did not suggest any such thing, I simply made an observation about the symptoms he was experiencing.
It has the classic signs of a clogged catalytic converter , UNLESS he doesn't have one , if so , that probably isn't what's causing his problems .��
If they do become clogged or go bad, they CAN be replaced. ��
I knew there was a 50/50 chance of it, but I said it anyways. I was in no way intending to attack or flame you
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Old 04-10-2012, 10:31 PM   #8
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I am not sure if yours is the same but I was told by a close friend today that the TPS has to be set by some sort of scan tool on my 90, and mine is adjustable.
I had some problems with mine today missing and running weak. I thought it was the CPS again, but my fuel filter was clogged...... I also put some Seafoam in the throttle body while I was at it, and man what a smoke show. It runs much more better gooder now, but I need to drop the tank and get the sand out of there. I also got a new gas cap which must have let some stuff in there on the last boys night out
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Old 04-10-2012, 10:43 PM   #9
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I also rip the tags off the mattresses and pillows. Lol
Crank position sensor will cause some of the demons your having, however I've never heard of one acting up at idle.
I changed mine out when it started back firing through intake, fixed me right up.
I think it was $50 @ advance and about 15-20 to put it on.
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Old 04-10-2012, 10:45 PM   #10
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15-20 minutes that is.
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Old 04-11-2012, 09:54 PM
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Xpress, let me say this clearly: SCREW THE FEDERALLY MANDATED LAWS. The first thing I do with ALL my rigs is cut the cat out. I don't care who knows it either.

Hell, even the cops in town call and ask me about cat Eliminator kits/o2 bypassing.

That's the difference between living in an imperialistic state, and living in Arkansas.

I'm not being rude either, so don't take it that way. I just hate that Big Brother has to have his fist up everyone's a**.
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Old 04-11-2012, 10:30 PM   #12
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Don't expect this thread to keep open long, not only is it a Federal crime to remove Federally mandated emissions equipment, but it is highly frowned upon on this forum. Some forums would immediately ban members that talk about Federal crimes...
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Old 04-11-2012, 11:51 PM   #13
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There's a difference between big brother having a fist up your a** and the government enforcing(barely) laws. And this is coming from a guy whos jeep exhaust is a little unconverted if you catch what I'm saying

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