93 Grand Prix Rough Idle

Hittle
10

Asked by Mar 01, 2013 at 07:48 AM about the 1993 Pontiac Grand Prix 2 Dr SE Coupe

Question type: Maintenance & Repair

8 Answers

Hittle
10

I am working on a 93 Grand prix with a 3.1. I just installed the motor. it started right up and ran fine until it started to warm up and come down to its low idle. the warmer it gets the rougher the idle. if you give it a little fuel or drive it, clears right up and has plenty of power. I changed the the following parts most of the used from the other motor. idle sensor, throtle position sensor, coil pack, new plugs and wires, EGR valve, pcv valve, Fuel presure regulator, new fuel filter, New Fuel pump(old one had low presure), Purge silinoid, Map sensor. None of these things have had any affect. Not sure what to look at next. Any help would be apreaciated.

1 out of 1 people think this is helpful.
tenspeed
87,225

It sounds like you covered everything. Try getting the codes read to see if any are pending. Good luck.

Hittle
10

No codes

Michael McGrail
8,965

Being a 93.. Codes rarely come up.. Unless it is something to do with the emissions system.. When you replaced the coil packs, did you check the ignition control module (the flat plate they snap onto) for damage. Also, the knock sensor located on the lower rear of the motor. Make sure it is connected and the connector is not loose or damaged. Are you getting any smoke from the exhaust when it starts running rough?

Michael McGrail
8,965

I asked about the knock sensor, because when I had to swap the 3.1 in my 93 z24, I accidentally broke the clip for the knock sensor and when it came loose the car would start running like crap at idle, but would drive just fine.. Sounds quite similiar to your symptoms.

1 out of 1 people think this is helpful.
Hittle
10

Thanks for a fresh idea. But it seems well connect and ok. I put the complete base and coils on. There is no smoke

Michael McGrail
8,965

Your problem just sounds so much like my knock sensor issue I was having..

Michael McGrail
8,965

No smoke, rough idle.. Would have to be running lean then.. Just need to find out why.. Maybe a clogged fuel filter? or injector? Best of luck on your search for the issue.. I know the pain of finding the gremlin..

Your Answer

Add photo

Related Questions

  • 2004 grand prix rough idle 1 answer

    I have a 2004 grand prix GTP 3.8 supercharged. When I start it up if it doesn't go into reduced power mode it will go up and down in rpms 100-200 unless I keep it above 1000k. It also smells like i...

    2004 Pontiac Grand Prix GTP

    -

    Maintenance & Repair

  • runs rough 3 answers

    1996 pontiac grand prix, car is hard to start, with this an intermittment problem, the other day it was very hard to start and while driving home, car died, It would restart (difficult) and was run...

    1996 Pontiac Grand Prix

    -

    Maintenance & Repair

  • 08 Pontiac grand prix 3.8L V6 running rough out of the blue 5 answers

    I was driving my car this morning and it was running perfectly fine. Stopped somewhere. Then when I got back in my car and tried to start it. It did not start right away and is all of a sudden run...

    2008 Pontiac Grand Prix

    -

    Maintenance & Repair

  • 2004 Pontiac Grand Prix Ask me any questions 33 answers

    I have totally replaced and rebuilt this car. I have experienced some major obstacles and solved them. I have experience with this year model Grand Prix. I may be of some help to others.

    2004 Pontiac Grand Prix GTP

    -

    Maintenance & Repair

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 4,300 nationwide Grand Prix listings starting at $1,000.

ZIP:

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 3,590
#2 Tom Demyan
Tom Demyan
Reputation 2,450
#3 munron
munron
Reputation 1,930
View All

Related Models For Sale

Used Chevrolet Impala"
839 Great Deals out of 33,339 listings starting at $1,300
Used Pontiac Bonneville"
4 Great Deals out of 862 listings starting at $1,900
Used Pontiac Grand Am"
1,982 listings starting at $500
Used Ford Mustang"
751 Great Deals out of 39,922 listings starting at $1,600
Used Chevrolet Camaro"
731 Great Deals out of 37,782 listings starting at $2,650
Used Nissan Maxima"
409 Great Deals out of 22,907 listings starting at $1,995
Used Honda Accord"
1,201 Great Deals out of 75,065 listings starting at $1,395
Used Nissan Altima"
1,430 Great Deals out of 83,024 listings starting at $1,395

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
22 Great Deals out of 551 listings starting at $1,500
2007 Pontiac Grand Prix For Sale
4 Great Deals out of 594 listings starting at $2,600
2006 Pontiac Grand Prix For Sale
3 Great Deals out of 760 listings starting at $1,900
2005 Pontiac Grand Prix For Sale
4 Great Deals out of 484 listings starting at $1,895