how do I tune up the 3.1 L motor?

50

Asked by Apr 14, 2012 at 05:18 PM about the 1995 Pontiac Grand Prix 2 Dr SE Coupe

Question type: Maintenance & Repair

the motor is running like it has a miss in it and is lacking power

6 Answers

89,945

Check out http://www.gaownersclub.com The Grand Am used the 3100 & 3400 motor. They have knowledgeable people and DIY instructions.

1 out of 1 people think this is helpful.
6,435

i did a sparkplug / wire change/ ignition module & coil change to get the engine smoother. have you changed the fuel filter? that might help the lack of power.

1 out of 1 people think this is helpful.
15

PROBABLY ONE OF THE THREE COILPACKS IS NOT WORKING

1 out of 1 people think this is helpful.

the best why is to change the spark plugs , air filter , fuel filter, ignition wires & pcv.if it still has a miss check your vacuum lines and o2 sensors.

1 out of 1 people think this is helpful.
12,035

Do a vacuum check. Here is a guide to help trouble-shoot. Here is a good reference for vacuum trouble shooting.......... You should get between 17-22 in. hg. at idle, depending on your elevation above 2000 feet MSL or mean sea level. To perform this test hook vacuum gauge directly to manifold vacuum. 1. Low steady needle usually indicates leaky intake, a leaky vacuum hose, late timing, or incorrect camshaft timing. 2. If reading is 3-8 inches low and fluctuates at that low reading suspect an intake manifold gasket leak at intake port or faulty injector. 3. If the needle has regular drops of about 2-4 in hg. at a steady rate the valves are probably leaking. (Perform a compression check). 4. An irregular drop or down flick of the needle can be caused by a sticking valve or an ignition misfire. 5. A rapid vibration of about four in hg. indicates worn valve guides. 6. Slight fluctuation of one inch or so indicates ignition problems. 7. Large fluctuation perform a compression check. 8. If needle moves slowly through a wide range check for PCV issues. Hope this gives you a good place to start and helps you figure it out.

2 out of 2 people think this is helpful.
535

also clean out your throttle body. Use some carb cleaner and some large pipe cleaners to get all of the carbon build up off of the throttle plate then put some injector cleaner in your fuel tank. this makes a big difference. good luck

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 3,753 nationwide Grand Prix listings starting at $1,195.

ZIP:

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 3,770
#2 Tom Demyan
Tom Demyan
Reputation 2,520
#3 munron
munron
Reputation 2,010
View All

Related Models For Sale

Used Chevrolet Impala
927 Great Deals out of 36,332 listings starting at $1,800
Used Pontiac Bonneville
3 Great Deals out of 667 listings starting at $2,298
Used Chevrolet Monte Carlo
16 Great Deals out of 1,728 listings starting at $1,695
Used Pontiac Grand Am
1,716 listings starting at $1,995
Used Ford Mustang
678 Great Deals out of 38,414 listings starting at $1,963
Used Chevrolet Camaro
658 Great Deals out of 39,376 listings starting at $2,995
Used Nissan Maxima
405 Great Deals out of 25,074 listings starting at $1,500
Used Jeep Grand Cherokee
1,131 Great Deals out of 69,896 listings starting at $495

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
13 Great Deals out of 463 listings starting at $1,995
2007 Pontiac Grand Prix For Sale
521 listings starting at $2,000
2006 Pontiac Grand Prix For Sale
7 Great Deals out of 618 listings starting at $2,000
2005 Pontiac Grand Prix For Sale
6 Great Deals out of 438 listings starting at $1,195