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73-87chevytrucks.com
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73-87 Chevy _ GMC Trucks
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Cleaned IAC and Got A code 42.
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Topic: Cleaned IAC and Got A code 42. (Read 2340 times)
DnStClr
Senior Member
Posts: 1809
Cleaned IAC and Got A code 42.
«
on:
November 02, 2008, 08:24:04 PM »
1987 Silverado 350 tbi- My idle stays high after it starts and warms up. I haven't put my tach on it yet. I removed and cleaned the IAC and it didn't help the idle, but it started throwing a 42 code.(EST) When I disconnected the battery B+ and reconnected it, the code went away so I guess the spark timing is ok. What caused the code? Is it normal after removing the IAC?
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Don
87 Chevy Silverado
Captkaos
OWNER and Administrator
Administrator
Senior Member
Posts: 18369
Re: Cleaned IAC and Got A code 42.
«
Reply #1 on:
November 03, 2008, 01:47:28 PM »
I would drive it to see if the code comes back.
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Chris Lucas
73-87chevytrucks
captkaoscustoms
squarebody
VileZambonie
Global Moderator
Senior Member
Posts: 19021
Re: Cleaned IAC and Got A code 42.
«
Reply #2 on:
November 03, 2008, 03:34:30 PM »
You should remove the B- not the B+. It could very well have caused an eroneous code. Spray some carb clean under the TBI and see if it effects the idle.
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74 GMC
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75 K5
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84 GMC
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86 k20
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DnStClr
Senior Member
Posts: 1809
Re: Cleaned IAC and Got A code 42.
«
Reply #3 on:
November 06, 2008, 10:22:28 AM »
It hasn't returned this week so far. No change in idle when carb cleaner sprayed.
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Don
87 Chevy Silverado
Blue 82
Frequent Member
Posts: 281
Re: Cleaned IAC and Got A code 42.
«
Reply #4 on:
November 09, 2008, 07:14:08 PM »
I had a sticking TPS switch cause the same exact malfunction (hi idle)
Cleaned the IAC, checked for vacuum leaks etc, nothing....
it's was acting up for a month or so, on and off
the light finally came on (code 22)
Replaced the TPS and all is fine
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82 stepside 2wd 355/th350/3.08 posi
VileZambonie
Global Moderator
Senior Member
Posts: 19021
Re: Cleaned IAC and Got A code 42.
«
Reply #5 on:
November 10, 2008, 01:32:08 PM »
Check the TPS as suggested. If it checks out ok replace the iac motor.
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/ _ _ _\_
⌠ŻŻŻŻŻ' [☼===☼]
`()_);-;()_)--o--)_)
74 GMC
,
75 K5
,
84 GMC
,
85 K20
,
86 k20
,
79 K10
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Cleaned IAC and Got A code 42.