Rick's Free Auto Repair Advice

Posts Tagged: surging idle

Vibration at idle – Jeep

Fix Vibration at idle If you own a 2007-09 Jeep Compass or Jeep Patriot and you have a vibration at idle, start with this fix before replacing any parts. The vibration at idle affects the 2.0 and 2.4L engines. They can produce a vibration at idle  an uneven or surging idle while coasting in drive at speeds up to 5MPH. Chrysler has issued a software update to correct the problem. So get that done before you replace anything else. For more information refer to Technical service bulletin 18-017-08 Rev A. … Read More

How does an idle air control valve work

What is an idle air control valve Many people are confused about how idle air control valves work. An idle air control valve literally bypasses air around a closed throttle plate so the engine can get air at idle. Because it bypasses air, it’s also called an air bypass valve. Back in the days of carburetors, idle speed was adjusted by way of an idle speed screw. In fact, on many carburetors there were two idle speed adjustment screws; one for hot idle and another for cold. Turning the screw … Read More

P0505 P1505 P1129 surging idle CRV

Fix code P0505 P1505 P1129 surging idle Honda CRV If you have P0505 P1505 P1129 surging idle Honda CRV  you may have a bum idle air control valve (IAC). Here’s how to check. First, make sure the coolant level is full and that the cooling line running to the IAC is hot. If the line isn’t hot but the engine is, the line is blocked. Clear it before proceeding. Next, cover the throttle body while the engine is running. The engine should stall. If it doesn’t, you have a vacuum leak … Read More

Should you get induction service?

Is induction service a rip off? Shops recommend induction service for customers, even though it’s not listed in the car maker’s maintenance guide. Induction service can also be called fuel induction cleaning or air induction service, but it all means the same thing. What we’re talking about here is cleaning the air cleaner box, ductwork, and the throttle body. Some shops also spray an upper cylinder cleaner into the intake to clean carbon off the valve stems. Cleaning the air filter box is supposed to be part of the air … Read More

Surging idle on Honda vehicles

How to fix a surging idle on Honda vehicles If you have a Surging idle on Honda, read this post. Most computer controlled vehicles rely on the coolant temperature sensor to tell the computer whether the engine is cold and needs a rich mixture. The computer then commands the idle air control valve to open to the correct setting. However, any vacuum leak in the system can screw this up. The extra air leans out the mixture and the engine starts to die. So the computer tries to compensate by … Read More


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