Hello...I have a 2009 chevy cruze 1.8L ,some 3 months ago,the car had some pulsating and vibration during driving , so I changed the spark plugs and the problem was solved, but after about a month,the car has started to pulsate and vibrate when idle,as in stopping at a traffic light,but not during driving, the pulsating at idle was really annoying,noone couldn't identify the problem,after taking to several service points, one suggested to change the spark plugs again, and it worked, so my guess was a defected spark plug...but the problem is that the same issue is happening now AGAIN, after one month, the car is pulsating at idle time AGAIN!!!!!...I am really confused now,what could be the problem,something that is damaging the spark plugs in a month?!?!?!and please let me remind that during driving everything is perfect, its just pulsating when idle...Please advise...thank you

SOURCE: I have a chevy impala 2003 the car some times

HI!!!!!! if you try all this you say ... th efirst thing i woul do is take of the fuel filter is under drver side blow one side the one goes to the engine if you have problem blow in the filter this has to be clog o dyrty inside the filter now the crank posicon sensor follow the wire is only one connects to ignicion control module it goes to the left side of the engine some times on top of the oil pan. becareful dont get confuse w/ the oil sending unit

Harvey N Tawatao

• 3854 Answers
• Posted on Jun 11, 2009

SOURCE: chevy 350 no spark

Check the distributor module (ICM), it may have gone bad and needs to be replaced. It's around $40.00 and it's under the rotor in the distributor assembly. Check the red lead wire to the HEI for voltage, there should be 12 volts. It common for the ICM to fail on the HEI system and if you go to Auto Zone, they can give you the step by step instructions to replace the ICM. Good luck and keep me posted, be glad to help.

SOURCE: car problem

What does your spark plug look like when you took it out? Was it black/fouled out? If so, you may have bad rings on that piston/cylinder allowing crankcase oil into your cyclinder, thus fouling out your plug.

Ricky Peters

• 2620 Answers
• Posted on Jan 11, 2012

SOURCE: 1999 chevy k2500. changed spark plugs 4 times in 7 months. Runs good for a week then doesn't start. Changed spider, throttle body sensor. Still has no codes and once again won't start.

The next time it won't start ,pull a sparkplug wire and see if you're getting fire.Then we'll known whether its a ignition or fuel problem and go from there.

SOURCE: car pulses and rpm fluctuates what is it?

if the car is running does it have the check engine light on? if yes what is the code if no then check to see if temp sensor is reading the right temp by plugging in a scanner that can read all data to give you an accurate reading... if it reads wrong temp it can cause running issues