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| High Idle 3800 swap (Page 1/1) |
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Lou6t4gto
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APR 27, 12:32 PM
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1986 coupe/ 3800SC Swap, seems to Idle a little high. Tach doe not work , but I'd say it idles at about 12-1300 RPM, should be at around 900. cannot find a vacuum leak. shouldn't the ecm be keeping it set at correct RPM?? IDEAs ?? Thanks
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Darth Fiero
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APR 27, 08:00 PM
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First thing you need to do is connect a scan tool to the PCM and bring up RPM, desired (idle) RPM, and IAC position data. The PCM will attempt to get the engine RPM to operate at the desired RPM reading by adjusting the IAC valve. Typical IAC position counts at warm idle should be around 30-80 counts. If you are seeing 0 IAC position counts with the engine idling too high, unplug the IAC and then shut off the engine. Remove the IAC valve and see if it is fully extended which should close off the IAC passage in the throttle body. If it is, then you have a vacuum leak somewhere you have not found.
If the IAC valve is not fully extended with the IAC counts sitting at 0, then it is possible your IAC valve is bad or there is a wiring problem.
If you don't see IAC counts dropping to 0 with too high of idle, let me know what you are seeing for IAC counts as well as what TPS voltage is at closed throttle.
-ryan------------------
More is more. Less is not enough.
Custom GM OBD1 & OBD2 Tuning | Engine Conversions & more | www.gmtuners.com
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Lou6t4gto
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APR 27, 11:19 PM
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wish I Had a Scanner, but I don't. TPS is new. will have a look at the IAC (Probably Original)
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Threedog
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APR 30, 11:38 AM
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| quote | Originally posted by Lou6t4gto:
wish I Had a Scanner, but I don't. TPS is new. will have a look at the IAC (Probably Original) |
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You can pick up a bluetooth scanner on amazon for ~$20-30 that hooks up to your phone. It is a vital tool.
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Lou6t4gto
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APR 30, 12:39 PM
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don't have a cell phone either ! LOL
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Lou6t4gto
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APR 30, 05:07 PM
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IAC lloks good, could the crank sensor affect it ? got a PO336 I need to address.
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