96 sunfire, hesitates around 2500 rpm

10

Asked by Apr 20, 2010 at 09:50 AM about the 1996 Pontiac Sunfire

Question type: Maintenance & Repair

my 96 pontiac money pit/sunfire with 2.4 has a weird hesitation. Its like its running out of gas. It seems like if u accelarate lightly it does it and if u accelarate hard its fine. well kinda. sometimes u can drive it with no problems, other times it acts up. I just bought the car it has 220 000 km. I just replaced the head gasket and the valves as when i got it it had a burnt vavle because it had a bad plug the previous owner could not get out. no check engine light, plugs r new, found a couple of bad orings on fuel rail have been replaced. think i need to replace the coolant temp sensor as the fan doesnt come on, but the fuse, relay and motor r all good.

yes i replaced the fuel filter...lol

o aswell when it warms up to temp, and u hold it at 1500 rpm its hesiates aswell, kinda seems like it is goen to died but it has never stalled out on me yet....knock on wood....all vacum lines r good.

o and one more thing to my novel, i checked the fuel pressure and it reads 44psi with key on
40psi after sitting for ten mins
40psi idling
in the haye manual it sayes to pinch the return line if u have low pressure and if the pressure goes up its the regulator.
but mine dosent have low pressure so i would assume i can rule that one out.




HHHHHEEELLLLPPPP!!!!!!!!!!

13 Answers

10

another thing, the fuel pressure dosent change when it hesitates at 1500rpm,

10

helppppp......any body out there.....

1 of 1 people found this helpful.
8,960

Possibly a dirty or bad maf or throttle position sensor.

10

ha larry, no maf on this one, not sure if it rules it out or not but if i unplug the tps it runs the same

3,105

You could have a plugged exhaust. Pull the B1S1 HO2 and then go drive it and see if your hesitation goes away. Your cat or muffler could be plugged or have loose internals causing limited flow and your hesitation.

1 of 1 people found this helpful.
10

worth a try, had to replace the cat with a used one because the flex pipe broke. it looked good when i put it on like two weeks ago

8,960

It shouldn't run the same with the throttle position sensor unplugged. Use a multimeter and check your voltage. Measure the voltage across it with the key on as you move it. Chances are you will see a sudden drop while opening it indicating that it needs replaced.

35

hey check your block.

(I am just learning car terminology and how to work on cars; so bear with me) I have the same problem. My 99 sunfire 2.4 GT hesitates exactly like yours. All the typical things, that are often responsible for the hesitation, as you have already listed, have been checked on my car. The only thing I can say is that the air filter was dirty one time so I removed the hose all together (that the MAF meter is connected to) so that unfiltered air went directly into the resonator. My HESITATION ACTUALLY WENT AWAY for about 5 hours. Then came back!!! PLEASE PLEASE PLEASE let me know if you fixed your problem and how you did it! I am so pissed about this (aside from this minor problem the car is great). Cheers man, Shawn.

Was anything brought o light on this subject? I have a 2000 sunfire with he same deal- plugs and wires are new"er" havent checked fuel pressure yet but will tomorrow- car has 141,xxx on it @ this time Help?

5

These cars do have a maf sensor it is actually right at the top of the throttle body that hole on the left side is it

10

I had similar problem and while i was looking for the TPS I noticed the tube(hose) from the intake manifold to the intake pressure sensor was slightly cracked. I replaced it and my sunfire has been purring like a kitten since. Hope this helps. I suffered with this hesitation for more than 3 years.

1 of 1 people found this helpful.
20

I had the same problem in my 02 GT 2.4. I changed EVERYTHING. coils, ICM, MAP sensor, TPS, plugs, plug boots, fuel filter, ALL with OEM parts, AC DELCO, Delphi, auto lite boots. Nothing helped. The Coil housing looked brand new. No burns no carbon buildup. Nothing. So I didn't replace it until today, and that is what finally fixed it. The COIL HOUSING which has no electronic parts nor moving parts fixed the problem.

1 of 1 people found this helpful.

Your Answer

Add photo

Related Questions

  • 2000 sunfire wont start 9 answers

    engine wont start unless you pump the accelerator and runs if you keep the rpms up, it dies if you try to let it idle. I replaced the fuel pump and crank position senor. it was running fine one day an...

    2000 Pontiac Sunfire SE

    -

    Maintenance & Repair

  • 2002 Pontiac Sunfire 2 answers

    My sunfire has really been acting up. It is hard to start sometimes and it started to chug as if it is running out of gas when it idles and sometimes when it is driving. We just replaced the spark pl...

    2002 Pontiac Sunfire SE

    -

    Maintenance & Repair

  • 2002 Sunfire 2.4 bucks under load and on highway when trying to accelerate. Why? 13 answers

    I have changed the ignition coils, fuel filter, plugs and idle air controller, but the car will still buck when I accelerate in 5th gear at 65 or just accelerating in 2nd thru 5th at low RPMs. What...

    2002 Pontiac Sunfire GT

    -

    Maintenance & Repair

  • the transmission in my 95 pontiac sunfire slips sometimes but not others. 2 answers

    My sunfire has an intermitent slip problem. Sometimes it drives no problem, today I backed it out of the garage turn it around and left it running for 10 mins went to move it and it wouldn't move...

    1995 Pontiac Sunfire

    -

    Maintenance & Repair

  • 96 sunfire se 2.2L 1 answer

    Ok guys I am a v8 guy. I know nothing of 4 banger and how to make power. I am useing this car for dirt track raceing. Could I have some suggestions on what to do to the 2.2 for rpm and power. As ...

    1996 Pontiac Sunfire 2 Dr SE Coupe

    -

    General

Sunfire

Looking for a Used Sunfire in your area?

CarGurus has 310 nationwide Sunfire listings starting at $3,975.

ZIP:

Search Pontiac Sunfire Questions

Pontiac Sunfire Experts

#1 John Saffrahn
John Saffrahn
Reputation 2,680
#2 Joeyadams
Joeyadams
Reputation 1,320
#3 Warren0007
Warren0007
Reputation 1,230
View All

Related Models For Sale

Used Chevrolet Cavalier
1,000 listings
Used Pontiac Firebird
12 Great Deals out of 724 listings starting at $3,990
Used Pontiac Grand Am
1,215 listings starting at $1,999
Used Toyota Camry
1,006 Great Deals out of 90,918 listings starting at $650
Used Pontiac Grand Prix
30 Great Deals out of 2,871 listings starting at $900
Used Ford Mustang
474 Great Deals out of 45,735 listings starting at $1,999
Used Chevrolet Camaro
226 Great Deals out of 30,943 listings starting at $1,217
Used Chevrolet Impala
521 Great Deals out of 31,726 listings starting at $1,450
Used Ford F-150
2,198 Great Deals out of 206,316 listings starting at $1,499

Used Cars For Sale

2005 Pontiac Sunfire For Sale
71 listings starting at $3,975

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.