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Old 07-13-2015, 10:45 PM   #1
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02 zx3 rough idle

I need some help. I've recently replaced the IAC valve do to rough idle. After replacing once I start the car it revs to 2100 rpms then goes to about 700 rpms until warm then verys at 700 to 500. Also after replacing IAC valve the accelerator gets stuck while driving at about 60-65 mph. So I put it in nutrual and engine revs to about 4500rpm. Any ideas on the problem?


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Old 07-14-2015, 02:16 AM   #2
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Moved to General Tech Chat, better here since it isn't a performance modification question.

750 or a bit more would be OK once warmed up, sounds like something else is affecting idle speed as well to make it drop to 500 & back up.

A/C on when that happens? Check for vacuum leaks yet?


Need more info. on the 'stuck accelerator" comment. DO check the throttle body for smooth movement throughout the travel, clamping the intake hose too firmly is one way to distort it enough to stick at times.
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Old 07-14-2015, 06:18 AM   #3
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Yeah I run the A/C and it idles rough. I may have over tightened the air intake to tight to the the throttle body. Ill loosen it up after I get off work. I'm replacing the IAC valve agian Wednesday, planning on taking the throttle body off to clean it. I know ford has a special coating on them what should I clean it with?
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Old 07-14-2015, 06:20 AM   #4
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But while at at 60+mph that's when it sticks. Stays at about 2100 rpms or so i put the car in nutrual and it revs to 4000rpms and stays until I put it back into drive..
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Old 07-14-2015, 11:14 AM   #5
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Carb cleaner or MAF cleaner will work without damaging anything.
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Old 07-14-2015, 11:23 AM   #6
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They take that coating right off but it literally does nothing anyway. Mine built up deposits virtually the same with or without the coating. Any solvent like carb cleaner removes the coating pretty quick, you don't need it. Another attempt to get you to buy new TB when you think you ruined the old one, not so. Just don't get any solvent in the TPS switch.

Vacuum leak most likely and why the rpm goes up and then idle is ragged. Could be overtightened as well, the plastic doesn't like that. Could now be leak at TB gasket to intake too.

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Old 07-14-2015, 11:54 AM   #7
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Best way to clean the TB to take it off? I'll try losing the air intake from the TB to see if that helps the random accelerator sticking.
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Old 07-14-2015, 12:20 PM   #8
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I clean them all the time with them still on, the major area that needs cleaning is at the edges of throttle blade and the immediate area they contact when closed to get the small aircrack at closed throttle clean there. A problem for you as you already have too much air passing through now, the leak.
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Old 07-14-2015, 12:25 PM   #9
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Idk how I have a leak when I never removed the TB. Just replaced the IAC valve...so replace the TB gasket?
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Old 07-14-2015, 01:36 PM   #10
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You're good and my bad. I zipped over the over tightening statement to think you had removed it rather than the intake tubing. Leave TB alone in that case.
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