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Running fine on gas rough on petrol

Car started to back fire after mechanic put wrong air filter in put new air filter in it ran fine for a week now back fire on gas when car warm it back fires on gas when at a intersection and you put your foot into and bank going along highway never misses a beat when the cruise control on drop back a gear and bang seems only to back fire when its warm it had a lifter nock a while back but no sign of that now car sound perfect when from idle to 2000 revs so on the throttle sencor i have disconected the wireing from the sensor and screwed the idle screw up for it to idle i took it to the mechanic at firts because when it was hot it would not start on gas with out pumping the throttle a little bit to grab the revs then fine the mechcanic put new plugs in it not speacl gas one check the leads and the timing whent well for a week then more backfires some gas that i seem to buy is worse than orthers **** gas every where it has only just started to run rough on petrol i mean rough hardly runs i put a air compresser to the crankangle sensor how do you tell if the gas petrol switch is not fully shutting off when running on petrol i checked the timming with a timming light not sure witch way advantced but on gas the timming gaguge line was allmost verticle with the engine 35mm to 40mm from the gaguge on the block the petrol was 10mm and under the same direction i thank you for your help i have taken to many mechanics with out fixing the problems that i have asked i hope you can help me thanks anthony

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  • 13 Answers

First you did not mention your car brand. Anyhow its not seem ens a big problem.what i understand is your car advances not working properly & secondly your car ignition coil(s) or both plug cods & coils.
in last your car can not maintaining low rpm it might be from throttle body idling switch or main butterfly ..... or might be your car Tappet sating out or some head valves are jam ..do a proper check from codified mechanic ..... this is a basic of your car, now if you need any further help you can mail me on tallnsmartman@yahoo.com... best of luck....

Posted on Nov 21, 2013

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Posted on Jan 02, 2017

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SOURCE: 1995 Toyota camry Le 4C Missing Problem -

i have came across simler problems in the past so im going to give you a list of four main suspects number 1; a broken or pereshed vacuum hose at the trottle body or inlet manifold.2 a blocked injector 3 a fuel injection system fault 4 a disconnected /leaking or perished crankcase ventilation hose.Before you try any of these by a can of fuel cleaner and run it through your system remember a small piece of dirt half the size of grain of salt is enough to cause this problem good luck.adrian

Posted on Feb 16, 2009

  • 11 Answers

SOURCE: 1994 uick lesabre barely runs when pushing gas ped

also with request of pcv valve check does car shake or vibrate when trying to accelerate? if that is to be the case more than likely bad pcv valve.

Posted on Mar 31, 2009

  • 14036 Answers

SOURCE: After washing truck check engine light came on.

let up hood let it idle to dry watch the check engine light . it should be okay.let it idle it will smooth out.

Posted on Apr 12, 2009

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SOURCE: Engine idles perfectly and revs fine while in

ur having fuel supply or poor electrical supply problem thats why the engine cuts off underload/ check spark plugs or airflow meter condition as well....

Posted on Apr 08, 2010

  • 60 Answers

SOURCE: 1992 Lumina Backfire - I

I know you mentioned the EGR valve has been replaced, but you may have a bad 'new' part. I know the car is electronic, but has anyone checked its ignition timing (timing belt been looked at, I know it only has 77k on it). Is the fuel pressure regulator OK and it vacumm supply?

Posted on Nov 15, 2010

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