autozone said that they couldnt, but there has got to be a way to tell if its bad or not
My '93 2.2 has 40 to 80 ohms across coil terminals A to B and C to D,
then Infinite resistance between B and C and A and D.
The other checks are made with a Tech 1 scan tool and I.A.C. Node lights.
Sorry. I don't know if this applies to your later car--or if it's any help?
Alont
Quote:
The other checks are made with a Tech 1 scan tool and I.A.C. Node lights.
Sorry. I don't know if this applies to your later car--or if it's any help?
Only info I have in my GM service manual is this part... nothing about resistance values. Aside from a dealer, I don't know of any other way to check it...
However...
Quote:
Diagnostic Aids
Check for the following conditions:
Poor connection at PCM or IAC motor. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
Damaged harness. Inspect the wiring harness for damage.
Restricted air intake system. Check for a possible collapsed air intake duct, restricted air filter element, or foreign objects blocking the air intake system.
Throttle body. Check for objects blocking the IAC passage or throttle bore, excessive deposits in the IAC passage and on the IAC pintle, and excessive deposits in the throttle bore and on the throttle plate. Check for a sticking throttle plate. Also inspect the IAC passage for deposits or objects which will not allow the IAC pintle to fully extend.
Vacuum leak. Check for a condition that causes a vacuum leak, such as disconnected or damaged hoses, leaks at EGR valve and EGR pipe to intake manifold, leaks at throttle body, faulty or incorrectly installed PCV valve, leaks at intake manifold brake booster hose disconnected, etc.
thanks man, i appreciate it
its definatly more information than i previously had
Clean it off, put it back in, run engine, pump brakes hard and fast. Engine will be reving, but only slightly. Stop pumping, engine rpms drop, then rebound back up to idle. That's the way it works on my '96 2.2 manual.
DartBaron, It a Vaccum pressure from the power brakes.
Ah, yes, however, the depletion of vacuum from the pumping of the brakes removes air from the intake manifold, starving the engine of air while the throttle plate is closed. The IAC will open up its passage to let in more air, if it is working OK. Proper manifold pressure restored, the IAC closes back up. Not exactly a precision device, it overshoots the mark and the engine nearly stalls out. It corrects itself well enough to get things truly back to normal. In older engines, the vacuum difference would've caused choke plates to open to let more air in.
