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1996 vs v6 holden commerdore miss under load at high rpm

I have fitted new plugs h/t leads coil packs fuel filter air filter reco injectors another good DFI module Fuel pump pressure 250 psi and vol 2.5 ltr per min comp pressures 180 psi all cyls manifold vac seems ok With wheels locked and in drive engine will miss and breakdown when rpm is increased

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  • Cars & Trucks Master
  • 42,103 Answers

Check for collapsed catalyic converter innards as it will block the exhaust ( most noticeable at revs) tap the outside case with the heel of the hand and if ti rattles it may be your problem

Posted on Jan 19, 2013

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

01fordeb
  • 1033 Answers

SOURCE: Engine runs extremely rough, seems to be fuel

Have you changed the plugs, if any are fouled out or if any are worn, it takes more to fire it under load and may be spark knocking because one of the plugs can't fire off all the gas and cause it to skip or idle rough.

Posted on Jan 18, 2010

mudman4300
  • 33 Answers

SOURCE: Triton V10 Engine Shudders under load

have your fuel system vacuumed out our excursion did it as well the injectors are not at fault it is the fuel lines

Posted on Aug 07, 2008

roniecon
  • 6826 Answers

SOURCE: 86 Astro Van - Increasing miss with speed

You may have some contaminated fuel,use a additive called heet,for moister,and lucas fuel treatment,these are premium additives,do not just use any brand,these I know will fix the problem if it is in the fuel.

Posted on Jan 25, 2010

tunde007
  • 2382 Answers

SOURCE: x type jag 3.0 V6

Hi, What causes a cylinder to misfire? Basically, it's one of three things: loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression. Loss of spark includes anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. Causes include worn, fouled or damaged spark plugs, bad spark plug wires or even a cracked distributor cap. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder.

If you find a P0300 random misfire code, it means the misfire is random and is moving around from cylinder to cylinder. The cause here would likely be something that upsets the engine's air/fuel mixture, such as a major vacuum leak, a leaky EGR valve or unusually low fuel pressure (weak pump or faulty pressure regulator).

In the case of a steady misfire, isolating the misfiring cylinder is the first step in diagnosing the problem. The old-fashioned method for finding a weak cylinder is to temporarily disconnect each of the spark plug wires, one at a time, while the engine is idling. When there's no change in the idle speed, then you have pinpointed the weak cylinder.
A power balance test will tell you the same thing, but this requires some hookups and an engine analyzer. A power balance test is preferable to pulling plug wires, because it keeps you away from the voltage and prevents the voltage from causing any damage to the electronics in the ignition system.
When a plug wire is physically disconnected from a spark plug, the high voltage surge from the coil cannot follow its normal path to ground through the plug wire and spark plug, so it passes back through the coil. Most ignition systems are robust enough to withstand such voltage backups intermittently but not on a prolonged basis. If the coil or ignition module is already weak, it may push the component over the brink causing it to fail.

Posted on Nov 12, 2010

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1 Answer

My VS commodore misses when I accelerate, but idles ok. Replaced fuel filter, leads and spark plugs coil pack, still sick. Need Help


check the firing order ( crossed leads ) check operation of the injectors ( blocked or not squirting properly.

Jan 04, 2015 | Holden Cars & Trucks

1 Answer

My VS commodore misses when I accelerate, but idles ok. Replaced fuel filter, leads and spark plugs coil pack, still sick. Need Help


Sounds like you have a vacuum leak and when you accelerate it's sacking to much air the egr valve can cause this also

Jan 04, 2015 | Cars & Trucks

1 Answer

Changed spark plugs ht leads and coil and still the car is missing when i drive it wot am i missing


With the miss you have it could be a few things.
did you change all the coil packs?
did you refit the heat shields to the new spark plug needs as these can cause a miss .
it could be the electronic module under the coil pack.
it could be a faulty injector or fuel problem..

Aug 31, 2013 | 1998 Holden VT Commodore

1 Answer

1996 holden vs v6 acclaim, my car won't start


This is an indication that the fuel system is losing prime. It might be because the injectors are not sealing when the engine is off and the gasoline is syphoning back to the tank.

Feb 01, 2013 | Cars & Trucks

1 Answer

Misfire under load and check light comes on for a second have taken to Hyundai they said the usual Plugs Leads, Injectors and wanted around $600 to clean Injectors and Throttle body. I replace Plugs and...


Up hills & under a load --could be the EGR Valve
as you have a high vacuum load

The temp goes up on hills & yes the coil packs
could break down. That won't show up in the service
bay the way a dealer tests it.

Not the Throttle Body or Injectors
Sounds good & makes them money
first.
That is what they do,after 3 visits & parting
with your money, then they will work on the misfire
Sad isn't it

Never go to a dealer. Try a local shop

May 03, 2011 | Hyundai Accent Cars & Trucks

1 Answer

Triton V10 Engine Shudders under load


have your fuel system vacuumed out our excursion did it as well the injectors are not at fault it is the fuel lines

Jul 09, 2008 | 2000 Ford Excursion

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