1994 Honda Civic, 1.5L, 210,000 miles. Engine light came on recently. Car would stall or idle at 200 rpm and surge at 1500-1700 rpm. I have added fuel injector cleaner to gas and removed air cleaner and cleaned intake and throttle plate with cleaner. This fixed the idle problem but still have engine surge at 1500-1700 rpm. What sensor should I be looking at replacing or how should I proceed from here?
Throttle Surge
Dec 10, 2006
5 Replies
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Low coolant will cause throttle surge. Try filling the reservoir to MAX and see if the level drops next time it's cool. If so, fill to MAX again until its stable. No tap water.
'Curly'
and don't just check the bottle - check the radiator directly. if there's a leak or too much air, the bottle doesn't suck back correctly and can be full, even when the radiator's empty. only open when cool.
snipped-for-privacy@bucksportschools.com wrote in news:1165776381.939156.185730@
80g2000cwy.googlegroups.com:
Get the error code. It's still in memory even if the light's off now.
formatting link
page 15. The "tool" is a bent paper clip. Fluctuating idle is often due to a big air leak. First check your coolant as suggested by Curly and jim beam. If the fluctuation is still there, you need to check for suction at the lower port in the throttle body, immediately ahead of the throttle plate (engine full warm). If there IS suction, the Fast Idle Valve is stuck open.
Have you had the intake manifold off the engine? If so you may have not sealed the gasket well allowing an air leak. That happened to my
90 prelude. I replaced the gasket and gooped it this time and it solved the problem. Other possibility is vacume line leaks. Good luck.
What was the code??? A P0505 idle control malfunction? It's likely a bad IAC valve. Chip
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