A little jerking issue

[Rahul Jones]

Hey guys,

My car clocked 171,000KMs (almost 106,000miles). And lately it started making a slight jerking issue on move off and sometimes when I accelerate from a speed of 16KMpH (10MPH). Jerk on acceleration happens only sometimes. There is no signs of misfires. Spark plug looked like it needed replacement. I just to want to make sure if there is something else I should check. So, I can fix them all in one go. And my car is a 1996 Alfa Romeo 155 2.5 V6 with a manual transmission.

Thanks,
🙂

Topic

[college man]

Check the basics,cap rotor,plugs,wires,fuel filter if you
have one.Here is a link to help you with performance issues.

http://www.ericthecarguy.com/faq/solving-automotive-performance-issues

[Bill]

Since there are 20 different things that could cause your problem I would start with the obvious. If the plugs are worn out replace them. They could be the cause.

[EricTheCarGuy]

Symptoms like that under engine load are often due to ignition failures. If you feel the plugs are old, perhaps you should start with those. It’s probably a good idea to check the rest of the ignition system as well.

http://www.ericthecarguy.com/faq/solving-automotive-performance-issues

[Rahul Jones]

Thanks guys. Every mechanics I showed the plug wires said the wires look great and doesn’t look like that causing the issue. Hope changing the spark plugs will solve the issue. 🙂

[Gumpy Guss]

I would check first the fuel and the air filters. Don’t change the plug wires unless you’ve tested them with a water sprinkle and they’ve failed the test.

[Y]

If you have some sort of Idle air control and it is sticking, that might be the problem too, along with TPS sensor going bad. I noticed that my car occasionally does the same thing when taking off. If the idle goes a bit too low, the IAC tries to compensate and goes too far and causes a bit of a jerk.

[Rahul Jones]

Thanks.
Air filter is pretty much new. Fuel filter is doubtful.

I will check that too. I was going through my car’s workshop manual today I did see a method mentioned in it to test the IAC.

[Kevin Criswell]

[quote=”rahuljones” post=75904]Thanks guys. Every mechanics I showed the plug wires said the wires look great and doesn’t look like that causing the issue. Hope changing the spark plugs will solve the issue. :)[/quote]

Look great does not = working properly.

Long ago when I was not a mechanic yet I had a ’94 Talon that hitched and jerked on acceleration. Shops told me that the plugs and wires were fine and ohmed out with no issues. One day for giggles I replaced the wires and WOW the problem was gone. Turns out the number 1 wire was shorting out when hot and put under a load.

[Rahul Jones]

Thanks for sharing. I might give a shot on replacing the spark plugs for now as I am a student I can’t afford much for awhile.

Is there any other method to test the plugs wires?

[EricTheCarGuy]

[quote=”rahuljones” post=76011]Thanks for sharing. I might give a shot on replacing the spark plugs for now as I am a student I can’t afford much for awhile.

Is there any other method to test the plugs wires?[/quote]

[Rahul Jones]

Sorry for the late reply guys. Two days back I just replaced the spark plugs and man the car runs smooth now. I had doubt which spark plug to use and the one which was already there was the wrong one. Thanks guys for your help. 🙂

[EricTheCarGuy]

That’s great news! Thanks for the update and for using the ETCG forum.

[Rahul Jones]

[quote=”EricTheCarGuy” post=93188]That’s great news! Thanks for the update and for using the ETCG forum.[/quote]

Welcome and Thank You for this forum. 🙂

[Author]

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