Question about 1990 Buick Skylark

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I have a 1990 Buick Skylark, I am having problems with it backfiring in the throttle body and also have low gas mileage. I am only getting about 13 miles to the gallon. I have changed to plugs and wires. Also put on a new oxygen sensor.

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What motor does it have? If it is the quad four, you probably need to replace everything under the cover. If it is the 2.5, check your firing order/timing.

Posted on Mar 06, 2009

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Backfire issues


Does it also get poor gas mileage? The cam sensor may be the problem. The common problem is the magnet in the cam falls out, the ECM puts the engine in a mode that it will run but the timing is off usually causes bad gas mileage and could cause backfire.

Apr 05, 2014 | 1990 Buick Riviera

1 Answer

1997 2.4L Buick Skylark stalling during takeoffs


There could the dirt in the engine carburetor please clean it or the the engine is getting rich ,or the on board computer may be faulty in the car or the wiring of the spark plug is defective get it checked ..............................



Good luck............................

Jun 12, 2008 | 1993 Buick Skylark

1 Answer

It is a 1990 cutlass calais and it is popping and backfiring through the throttle body. we have already replaced the fuel pump, throttle position sensor, intake air temp sensor, o2 sensor, and the sensor...


If the car has high mileage, it is quite likely that the cam timing has changed due to a jumped timing chain or gear...depends on which engine it has?

Apr 15, 2011 | 1990 Oldsmobile Cutlass Calais

1 Answer

I have a 1995 buick lesabre and i changed control module,position sensor,cam sensor and computer. car stop and will turn but want start. when i first bought car it had this vibration on take off but never...


Are you getting gas and spark to the cylinders?

If you add gas to the throttle body, does it start?
If so, then you have a fuel pump delivery problem in this vehicle.

If it doesn't start, then you may have a spark problem at the spark plugs due to a coil pack going bad or a module (but you said you changed the module).

Also, is this a 1995 Buick LeSabre of a 1993 Buick Skylark (which it is listed under)? What engine size is this?

Aug 06, 2010 | 1993 Buick Skylark

2 Answers

What happens when it runs out of gas


SHOOT STARTING FLUID IN TO THE THROTTLE BODY, NOT TOO MUCH,BECAUSE IT WILL BACK FIRE, UNTIL IT STAYS RUNNING, IF THIS DOESN'T FIX THE PROBLEM, THEN FIND THE GAS TANK AND BANG IT WITH A RUBBER MALLET, NOT TO HARD, JUST ENOUGH TO SHAKE THE TANK.

Sep 23, 2009 | 1994 Buick Skylark

1 Answer

90 skylark Stalling, Inconsistent idle


If you have EFI your jets could be clogged and need to be cleaned. Also with the erratic idle it might be your Throttle Position Sensor. The only other things i can think of are your Catalyc Converter and with the cutting off your Fuel Pump. If you don't have EFI and if you are not familiar with carbuerators I would recomend having it checked.

Aug 25, 2009 | 1990 Buick Skylark

2 Answers

1995 BUICK SKYLARK


sounds like you have a vacuum leak.  Did you get everything back together correctly.  Did you leave the coolant sensor disconnected.

Mar 23, 2009 | 1995 Buick Skylark

1 Answer

Running rough or fast


If both the MAF and 02 have been replaced, try the TPS (Throttle Position Sensor) also check for vacuum leaks. the hoses that come out of the throttle body are very vulnerable to melt from heat.

Sep 15, 2008 | 1997 Buick Skylark

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