1997 Mazda Protege Rough Idle

GABY04

MEMBER
1997 MAZDA PROTEGE

Shakes or Wobbles problem
1997 Mazda Protege 4 cyl Automatic 154000 miles

ok now I have a problem thats has been happening the past few days.

my car rpm is bouncing up and down. The car is stuttering when at idle. It goes up to its normal 750 rpm then goes down to 200 rpm then back up to 750 rpm. Its even worst if I turn my a/c on. There are times the car does turn off.

i later tried throttle body cleaner in the throttle body/intake manifold and the idle was not rough and the rpm when up but when I took it for a test drive again later that same day it started running bad again.

i was also wondering if the bad idle can be caused by the maf sensor

there is also no check engine light

9 Replies

LEGITIMATE007

MECHANIC
5,121 POSTS

Yes if you sprayed it you could have damaged it. Have you checked your idle air control valve and fuel pressure?

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Wednesday, May 21st, 2008 AT 5:51 AM

LEGITIMATE007

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https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm

check fuel pressure here

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Thursday, May 22nd, 2008 AT 8:07 PM

GABY04

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Also I would like to thank you for the help you have been giving me. I have another question. If there is oil on the maf and air filter whats does the mean. I have heard different things and would like to know what you think it could be

thanks and I greatly appreciate your help

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Thursday, May 22nd, 2008 AT 9:14 PM

LEGITIMATE007

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Exactly, this is where everything comes full circle. P0100 is maf sensor malfunction.(Hence oil on the sensor). P0505 is idle air control valve, just like I mentioned for the idle and car shutting off. Now, the oil on your sensor is probably because you have a clogged pcv valve or egr tube, I would go with the pcv because its cheaper and more of a chance that this is the problem. So the bad idle is your idle air control valve. Also your probably gonna have to replace the MAF too because of the oil. But im bettng that the oil is because of a clogged pcv valve. So those three things should clear you right up. Idle valve, pcv, maf. In that order. But you must get all three. If your handy, you can change all of it yourself. Its pretty self explainatory

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Thursday, May 22nd, 2008 AT 10:49 PM

GABY04

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Thanks you covered everything. Everything is fine now. I changed my pcv valve, now there is no oil on the maf. I also changed the iac and cleaned the maf and it back to normal

i have another question, now my car is overheating at times. So I went to check my radiator fan and it is not turning on unless I have the a/c on. What could be the problem?

Also does it take some time for the radiator fan to turn on? Or does it turn on instantly when you turn the car on?

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Wednesday, May 28th, 2008 AT 3:53 PM

LEGITIMATE007

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No it doesnt immediately turn on, it will turn on once your car gets to a certain temp "hot". Also it should come on when you turn on your a/c. Also If you do have a problem with overheating then your engine coolant temperature sensor is the culprit. But don't be alarmed if your gage gets up there, when you should worry is when it starts to hit that red area. Anymore questions just stay in touch, also if you need to order any parts, we are very good with prices, just click on the link down by my name screen name and click on discount autoparts in the site menu

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Wednesday, May 28th, 2008 AT 8:44 PM