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96XJ Engine surges at 100kph/2500 revs, otherwise drives nicely

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  • Jaguar Master
  • 22,219 Answers

96 XJ6 ? try the engine breather as sometimes this can cause this sort of thing ,but i have a XJ 94 4.0 lt and at 55 miles an hour it surges ,well not the engine but the autobox its like it doesnt know if it wants to be in top or third and keeps changing up and down but according to a friend of mine who was a chauffer when these cars were new he said it was a fault present when new ,or in the trade its known as fault of the model .So check it out is it the engine or the gearbox changing gear like mine?

Posted on Jan 17, 2013

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Posted on Jan 02, 2017

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Zeevert
  • 373 Answers

SOURCE: CAR SURGES WHEN YOU ACCELERATE IN OVER DRIVE.

It may be the MAF sensor. In needs to be cleaned or replaced. Located on the throttle body, under the engine cover. Might need special anti-tamper Torx sockets to remove. 2 bolts. One wire connector.

I had to replace mine on 2002 3800 V6. Bucked and shook on moderate to hard acceleration at about 3500-4000 rpms.

Posted on Jun 06, 2010

  • 151 Answers

SOURCE: auto transmission problem in mitsubushi montero suv

Well if sounds like possible a vacuum modulator or if the fluid and filter haven't been changed in say 40,000 miles or more I would recommend changing the tranny fluid and tranny filter.

Posted on Apr 20, 2010

jmgldsmth
  • 1889 Answers

SOURCE: Engine surges. Idles good. sitting still in park, rev the engine and the surging is very evident as when driving. Fuel filter has been changed

hook a vacuum gauge to the intake manifold and, check for a vacuum leak in vacuum hoses and, fittings

Posted on Jun 01, 2009

johnjohn2
  • 5763 Answers

SOURCE: '98 Oldsmobile Silhouette-begins to surge at 2500

how about the sparkplugs and the wires, you may need to tune it up, sounds like it misfires under a load, i would start with a tuneup and go from there. the other thing that come to mind could be a bad coil pack, or low fuel presusre,if you have the computer scanned and pin point the cylinder or cylinders misfiring you could try switching coil packs or plug wires to see if the misfire move and if it does you would know if its a wire coil or plug, but if its been a while sence you had a tune up i would start with that.

Posted on Jul 15, 2010

pcdj64
  • 1150 Answers

SOURCE: Reving engine

could be a variety of things, is the check engine light on? possible the throttle sensor is bad, could also be a vacuum leak.

Posted on Sep 23, 2012

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CAR SURGES WHEN YOU ACCELERATE IN OVER DRIVE.


It may be the MAF sensor. In needs to be cleaned or replaced. Located on the throttle body, under the engine cover. Might need special anti-tamper Torx sockets to remove. 2 bolts. One wire connector.

I had to replace mine on 2002 3800 V6. Bucked and shook on moderate to hard acceleration at about 3500-4000 rpms.

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Fill the tank up but do not top off.

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If it stop surging then you has a weak fuel pump.

Change the fuel filter will also help.

Also check the fast idle setting.
==
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hook a vacuum gauge to the intake manifold and, check for a vacuum leak in vacuum hoses and, fittings

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