98 lumina 3.1L misfire/ reluctance accelerating

Perplexed
0

Asked by Feb 29, 2012 at 09:40 PM about the 1998 Chevrolet Lumina

Question type: Maintenance & Repair

When trying to acquire speed it feels like too little fuel or some kind of back pressure. It has happened with a hard acceleration, while in idle and simply pushing down on gas petal, or just trying to go from 25 to 30 mph. It seems to be  random. Happens one day and then won't act up again for two weeks. No check engine light.

I have changed fuel filter, fuel line, mass air flow sensor, and recently a catalytic converter. The catalytic converter seemed to fix the problem for a few months, but almost as a band-aid. This will be my second catalytic converter in 2 years so problem might be fouling the converter out too.

Any help is greatly appreciated.

4 Answers

OrLackThereof
2,185

I already answered this on another post you made for the same problem, but the way you described it there wasn't quite the same description you offered here.. Bottom line, you have global OBD-2....you need to take advantage of it for diagnosing your vehicle. Do a data-stream on the car and check out your sensor values...you have an intermittent problem, so your issue is going to be intermittent as well. Find or get yourself a scantool...you can get a fairly powerful OBD-2-only Scantool for $150 or less from various sources... Now take note of the values when it's running normally. The MAF signal response when stabbing the throttle from idle to wide open and returning to idle, as well as the Throttle Position sensor on a graph with the Key On, Engine Off...slowly opening it up from 0% all the way to 100% and back down, it should be a smooth linear graph taking into account your un-precise foot movement of course. Now take note of your ECT (Engine Coolant Temp) value, Misfire Counts, and your Short Term and Long Term fuel trims (STFT) and (LTFT). Those are the biggies. Take it with you always, and when it starts to act up, go through the values and compare them to what you had previously. Obviously do this pulled over and in a safe place.

3 out of 3 people think this is helpful.
90V6RedHotLuminaEuro
1,185

I believe you might want to check all the simple things first... especially if you or someone else had recently been working on the car, like changing the oil or something. Check ALL and EVERY BIT of your Wiring, Connectors and Vacuum Hoses. After you think you've checked them all and real good... check them again. See that none came loose, fell apart, cracked, burnt, etc... I had a similar problem with my old 90 Lumina Euro Coupe with a 3.1 V6. It's sometimes hard to tell with a visual. You have to tug on things, pop them off, look real close. Especially the Vacuum Hoses. They sometimes get split at where they connect up to... and it's hard to notice, especially when they're in tight, dark, places. After that, call around and see if you can borrow a Scan Tool. AutoZone has a Tool Borrowing program. You pay for the tool and get refuned when you bring it back... but it's for select tools only. Other places, like Advance also have a program like that. But call others and see if they'll help you out. After that, I'd go straight to eBay! I've never been disappointed there after over a thousand transactions. The sellers rely on feedback so they're not apt to screw you. I've saved a lot of money, and a lot of trips to auto parts stores and junk yards at eBay. Good LUck! John B. Ps. When I bought the car last year, the engine compartment was a mess. Under the Power Steering Pump was a huge bundle of wires mashed into the engine block. Many of the wires had melted and/or lost their insulation. I used "Liquid Tape" to repair the insulation. I also used "Liquid Tape" to seal some vacuum connections.

5 out of 5 people think this is helpful.
Perplexed
0

Thank you very much; I hadn't thought about utilizing the OBD2 scan tool while driving and observing levels.

Jose Torres
715

Sounds like the problem I had. Cheap scanners won't detect your problem. Had the car scanned by 3 different mechanics, couldn't find the problem. Find a good mechanic with the factory GM scanner. My problem ended up being the fuel injectors. They were releasing fuel at will, and the rest of the system was overcompensating by sending extra oxygen. Check the fuel/air mix scan, if its outside +/- 5 range, there's a push in the right direction.

3 out of 3 people think this is helpful.

Your Answer

Add photo

Related Questions

  • misfire and don't want to accelerate 1 answer

    1993 Chevrolet Lumina 2 Dr Euro Coupe

    -

    Maintenance & Repair

  • my lumina stalls every time i come to a stop what icould the problem be 25 answers

    my lumina has a 3.1 engine nad it stalls every time i come to a stop what is the problem

    1992 Chevrolet Lumina

    -

    Maintenance & Repair

  • Acceleration issues

    I have a 1995 Chevy lumina it starts up fine but once I push down the gas pedal it won't propel the car in reverse or forward

    1995 Chevrolet Lumina

    -

    Maintenance & Repair

  • 91 Chevy Lumina Stalls after running for 5 minutes 35 answers

    Just bought my son a 91' Lumina with a 3.1 engine. Starts up when cold and runs fine, idle lopes a little bit though. After 5 minutes it stalls and won't restart until it cools down. It's getting f...

    1991 Chevrolet Lumina

    -

    Maintenance & Repair

  • Misfire on '98 K1500 7 answers

    My truck idles and accelerates perfectly. It only misfires when I travel at a constant speed. Any advice would be helpful.

    1998 Chevrolet C/K 1500 Cheyenne Standard Cab SB 4WD

    -

    Maintenance & Repair

Lumina

Looking for a Used Lumina in your area?

CarGurus has 297 nationwide Lumina listings and the tools to find you a great deal.

ZIP:

Search Chevrolet Lumina Questions

Chevrolet Lumina Experts

#1 90V6RedHotLuminaEuro
90V6RedHotLuminaEuro
Reputation 1,050
#2 Justin Hatfield
Justin Hatfield
Reputation 1,040
#3 John Saffrahn
John Saffrahn
Reputation 1,000
View All

Related Models For Sale

Used Chevrolet Malibu"
983 Great Deals out of 56,610 listings starting at $1,995
Used Chevrolet Monte Carlo"
18 Great Deals out of 2,042 listings starting at $2,500
Used Honda Civic"
875 Great Deals out of 55,337 listings starting at $995
Used Honda Accord"
1,255 Great Deals out of 73,197 listings starting at $500
Used Chevrolet Silverado 1500"
1,912 Great Deals out of 121,757 listings starting at $1,500
Used Chevrolet Tahoe"
778 Great Deals out of 34,226 listings starting at $1,800
Used Ford Taurus"
329 Great Deals out of 19,060 listings starting at $1,499
Used Buick LeSabre"
36 Great Deals out of 2,635 listings starting at $1,200
Used Nissan Altima"
1,726 Great Deals out of 81,014 listings starting at $500
Used Pontiac Grand Prix"
72 Great Deals out of 4,483 listings starting at $1,700
Used Toyota Camry"
1,639 Great Deals out of 89,322 listings starting at $990