Need Help.....

[drako28]

My car seems to have a rough idle when the engine gets up to operating temprature. She started doing this before I changed the fuel filter and put Brand new AC Delco Platinum Plugs gaped at .060 and New Bosch premium wires in. Also tried the Sea Foam stuff. And it's still doing the same thing.
Just went yesterday to have the computer read to see if there are any codes coming up. Nothing showed up. Does anyone have any ideas what else might be wrong. Or which way I should go from here.

Thanks

[acold7dusta]

i wanna say that gap is too big, but check the air cleaner, it may be clogged

[drako28]

Changed the air cleaner and PCV the same time as the Fuel Filter.

[alero440]

Get rid of the bosch plugs. I have heard nothing but bad with bosch stuff. I will only use NGK plugs in my car. The wires are whatever came stock on it.

[jackal2000]

Get rid of the bosch plugs. I have heard nothing but bad with bosch stuff. I will only use NGK plugs in my car. The wires are whatever came stock on it.

steph, u skimmed da post. he has ac delco plugs and bosch wires. i doubt the wires would make it idle weird.

[alero440]

whatever, bosch bad, lol. Rough idle... it could be the EGR valve.

[drako28]

Can you take the EGR off and clean it? I would hate to spend $100 for a new one and nothing is wrong with the one I have. Or is there a way to test it to see if it's bad. Like I said, the computer did not record any error codes???

[jackal2000]

what engine do u have?

[drako28]

I have the 3.4. It's got about 89k.

[jackal2000]

im just throwing this out there......check your MAF and throttle body. if its dirty, clean it. just an idea....

[drako28]

I took it off yesterday and cleaned it. Still was doing it today.

[jackal2000]

maybe u have a vacuum leak somewhere

[drako28]

If it was a vacume leak wouldn't it do when it is cold too. It only does it when it's at normal temp?

[alero440]

You can check the EGR, but with that mileage on it I'd replace it. Its easy, and I got mine from the dealership for about $65. Mine was idling funny, the RPM's were revving up and down when driving. Replaced the EGR and it went away.

[drako28]

I called the local autoparts store they want like $130 for it. The Dealership wants like $190 for it. Can you take it off and clean it?

[alero440]

If its clogged up real good you won't be able to clean it. I guess its hard for me to explain how it works, and how to check it since its more of a visual thing. There is like a sping type thing inside of it that when that clogs it either stays open or shut and doesn't recirculate right. If it's fine, the spingy thing with move up and down with ease, but if its clogged, it will be difficult to move, if at all. I guess you could try some brake kleen on it, but the best thing to do (if thats the problem) is just choke up the cash and fix it. I can't believe how expensive it is for you, when I got an OEM one from the dealer for $65.

[drako28]

I called another dealership here in cleveland. They want $101 for it. That's the cheapest I've found so far. I'm leaning toward the EGR valve. Because when you drive the car it's got plenty of power doesn't hesitate at all. It's just shaking like it wants to die when your sitting at a light or something. I forgot to mention it doesn't shake when it's in park though. I don't know if it's because the RPM's go up on the motor or what???? I was also thinking if it could be that charcoal canister under the car by fuel filter. Maybe water got into it????? Just Guessing now....

[drako28]

:cry: This thing is driving me crazy...... I disconnected the battery and I changed the EGR Valve and The Coil Packs. She's still doing the same thing. Now I'm so confussed????? Does anyone have any other ideas? Or is my car ready for the junkyard.......:cry:

[Banks860]

need help my car hesitates when i drive. once it hits 3000 rpm it stops some body help me plz its killing me and its about to start getting cool out. 2.4l 1999 gx

[cherrington17]

need info, engine size, miles, if you changed anything....


check fluids, air filter, for leaks, etc.

[bkathsalero]

Vehicle Application:
2000 Pontiac Montana 3.4L
Customer Concern:
Erratic idle, stalls when the engine is hot.
Tests/Procedures:
1. Disconnect the Idle Air Control (IAC), check idle then.

2. Clean the following: Mass Air Flow (MAF) sensor elements, throttle bore, fuel injectors.

3. Disconnect the 7X Crankshaft Position (CKP) sensor harness at the ignition module, 3-way connector.

4. Test AC voltage from the 7X CKP sensor, engine cranking.

5. Should have over 700 millivolts AC when cranking.
Potential Causes:
7X Crankshaft Position (CKP) Sensor
Dirty Fuel Injectors
Diagnostic Codes:
None
Author: Ralph Dahlen
Average Reported Mileage: 150000
Confirmed Fix Summary
Confirmed Fix
2 - Fuel Pressure Regulator (FPR)
Confirmed Fix Details
Tech Reported Fix Details Confirmed Fix
Ben Fine
November 03, 2006 Confirmed Fix - Similar Vehicle Match 2000 Oldsmobile Silhouette, 3.4L *
Fuel Pressure Regulator
- fuel pressure regulator was leaking and spraying fuel
Fuel Pressure Regulator (FPR)
AutoSvc04
July 02, 2009 Confirmed Fix - Similar Vehicle Match 1998 Chevrolet Venture, 3.4L *
Replaced Fuel Pressure Regulator (FPR)
- fuel pressure regulator
Fuel Pressure Regulator (FPR)
- Confirmed Fix - Exact Vehicle Match - Confirmed Fix - Similar Vehicle Match *- Indicates a Similar Vehicle - Not an exact match to the vehicle selected

[bkathsalero]

/\/\ best way to check fpr is to run the car till it warms up. Shut it off and pull the vacuum line off of the top. If fuel begins to leak out. It needs to be replaced

[bkathsalero]

need help my car hesitates when i drive. once it hits 3000 rpm it stops some body help me plz its killing me and its about to start getting cool out. 2.4l 1999 gx

So it hesitates all the time? until 3000rpms it runs fine after that? When does it hesitate at take off. Hard take offs? cruising. When cruise control is enabled does its hesitate on hills? enough to disable the cruise control?

And are you sure it hesitates or is it a bucking jerking hesitation?
What have you diagnosed already?

Sorry for all the questions but intermittent hesitation can be a bitch to diagnose without personally driving the car