Power loss backfiring

Asked by Jun 19, 2016 at 02:57 PM

Question type: Maintenance & Repair

I have 1998 s plate 2.5 v6 vectra  car starts fine
and seems fine while the automatic fuel pump/
choke is on. When it goes off I try to accelerate
and back fires and has no power. If I accelerate
slowly it keeps the steady build up of power and
doesn't back fire. Once up to about 30 to 35mph in
second or third you can boot it with no loss of
power or miss fire. Can anyone help please.

1 Answer

11,725

To lean at start up, have it scanned for codes using an old GM / Opel tech2 scanner.. HEGOS could be slow, sounds like its running off the computer fuel map not closed loop. so MAF and or MAP need to be checked. Fueling signals, and Data can be read in real time then its easy to correct. Scan cost approx 65.00 GBP

Your Answer

Add photo

Related Questions

  • backfiring and power loss 5 answers

    Got a '91 chevy silverado 2500 4x4 5.7L. Got it from an old farmer. Just replaced the starter. Ran fine. Yesterday it started backfiring and it started smoking. I let it sit until it was done then ...

    1999 Chevrolet Silverado 2500 2 Dr STD 4WD Standard Cab LB HD

    -

    Maintenance & Repair

  • Loss of power 2 answers

    My 1992 Plymouth voyager 3.0 looses power when it gets hot I put a straight pipe thinking it was the catalytic converter and still doing the same thing also it backfires

    1992 Plymouth Voyager LE AWD

    -

    Maintenance & Repair

  • Backfire 1 answer

    Starts up backfires 5 seconds then runs great HELP

    2001 Chevrolet Blazer

    -

    Maintenance & Repair

  • 94 Backfiring in the Intake 2 answers

    I have a 94 Mighty Max and it just started backfiring into the intake at lower rpm's. it doesnt do this at higher rpm's. It will be a low level backfire in the intake and I will lose power momentaraly...

    1994 Mitsubishi Mighty Max Pickup

    -

    Maintenance & Repair

  • Backfire 1 answer

    I have change timing chain gears timing chain distributor coil spark plugs spark plug wires mass air flow sensor checked and rechecked my ignition timing not two but three times crank sensor and c...

    1998 Chevrolet C/K 2500

    -

    General

Shortcuts

Search Maintenance & Repair Questions

Maintenance & Repair Experts

#1 Tom Demyan
Tom Demyan
Reputation 165,750
#2 dandyoun
dandyoun
Reputation 90,460
#3 tenspeed
tenspeed
Reputation 73,320
View All