1996 Mazda Protege Rough Idling when engine is warm

Tiny
74MADURO
  • MEMBER
  • 1996 MAZDA PROTEGE
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
The rough idling occurs when the engine is warm. It doesn't matter if the transmission is in gear or neutral. The RPMs need to be above 1000 to avoid the roughness. I've cleaned the throttle body, replaced plugs, wires, rotar, cap, had fuel injectors checked. It is extremely high mileage, and I am going to get rid of it soon enough, but I still would like to know what is causing this issue. Thanks
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Thursday, February 19th, 2009 AT 11:16 AM

8 Replies

Tiny
RACEFAN966
  • EXPERT
Is the check engine light on? If so find a local parts store and have do a free scan and get the codes. Do you have a digital multi meter? Get back to me and we go from there.
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Thursday, February 19th, 2009 AT 11:20 AM
Tiny
74MADURO
  • MEMBER
No. The CE lite is not on, and I know it works.
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Thursday, February 19th, 2009 AT 11:23 AM
Tiny
RACEFAN966
  • EXPERT
OK have you tested the coil pack? Do you have a digital multi meter so we can test it and see what it is doing. Get back to me
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Friday, February 20th, 2009 AT 10:16 AM
Tiny
74MADURO
  • MEMBER
I don't know where that is on my car (what it looks like exactly), and how do I measure it properly with an OHM meter? And if it's a problem with the spark, would that give me trouble all of the time, not just when the car is running at normal opp temp?
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Friday, February 20th, 2009 AT 10:28 AM
Tiny
RACEFAN966
  • EXPERT
No not alway's as a coil can work fine when it cold then when it gets hot it will start to fail not uncomin. Now do you have a digital multi meter? If so then I will look up the test and tell you how to find out if it is bad. It looks like your coil is part of the distributor. I also need to know which engine do you have the 1.5 or the 1.8 DOHC. Get back to me.
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Saturday, February 21st, 2009 AT 9:48 AM
Tiny
74MADURO
  • MEMBER
It is a 1.5L. Also when I was driving it last week, I have since quite driving it, it was now starting to act up on the freeway. Missing and bogging down. I do have a DMM.
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Wednesday, March 11th, 2009 AT 10:25 AM
Tiny
RACEFAN966
  • EXPERT
Ok does it run fine when it cold and start to act up when it is warmed up?
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Wednesday, March 11th, 2009 AT 11:18 AM
Tiny
74MADURO
  • MEMBER
Yes. When it's cold it runs fine, when warm it runs rough.
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Thursday, March 12th, 2009 AT 10:46 AM

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