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1994 Chevy Astro 4.3l W - OBD1 code 35 and code 82


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rossman21
Novice

Oct 31, 2016, 1:23 AM

Post #1 of 3 (943 views)
post icon 1994 Chevy Astro 4.3l W - OBD1 code 35 and code 82 Sign In

I have a 1994 Chevy Astro 4.3L VIN W (CMFI) and I am get an OBD1 Trouble Code of 35 and 82.
In looking up these trouble codes, it seems 35 deals with the Idle Air Control (IAC) and 82 is the Crankshaft Position sensor.
I have just replaced the Idle Air Control (IAC) and reset the codes (disconnected the battery for 30 seconds). Both codes reappear. My next thought is to replace the Crankshaft Position sensor, but in 1994, there is no such sensor (that did not begin until 1995).

The transmission seems to shift fine - but, when I slow down it seems to idle high - like it is over revving.  When I stop, it idles high for a second or two, then corrects itself - and idles normally.

Any suggestions? Thanks!!!


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 31, 2016, 1:36 AM

Post #2 of 3 (936 views)
Re: 1994 Chevy Astro 4.3l W - OBD1 code 35 and code 82 Sign In

Codes don't tell you what parts to replace rather which circuit it sees has a problem. OBDI codes less useful IMO than OBDII but the symptoms are that IAC could use a cleaning or replacement and would check for vacuum leaks with a raised idle issue guess is either unmetered air in getting in or sticky parts that can't adjust quickly for proper idle speeds.


Some even OBDI engines by resetting codes you also have to wait for the vehicle to "re-learn" to set adjustments for what is normal to it now within the range of it's ability to adjust or set a code - credible or not,


T



Wrenchly
User

Nov 17, 2016, 2:18 PM

Post #3 of 3 (901 views)
Re: 1994 Chevy Astro 4.3l W - OBD1 code 35 and code 82 Sign In

Vacuum leak from the throttle body gasket is a common cause of the code 35.

Bad transmission wiring, 1/2 shift solenoid or bad vcm would be the code 82.
You need a transmission person to diagnose the shift solenoid circuit.






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