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Intermittant CHECK ENGINE LIGHT - 3800SC by PaulJK
Started on: 07-09-2013 08:20 PM
Replies: 7 (215 views)
Last post by: phonedawgz on 07-12-2013 09:13 PM
PaulJK
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Report this Post07-09-2013 08:20 PM Click Here to See the Profile for PaulJKSend a Private Message to PaulJKEdit/Delete MessageReply w/QuoteDirect Link to This Post
3800SC with 4 speed auto from 1999 Grand Prix GTP. Every once in a while the engine has a "hunting idle" 900 to 1600 rpm, gas mileage drops and the CHECK ENGINE light comes ON. Drive it for a while , idle returns to normal and the engine light goes out.

Yesterday the problem returned. Today I had the codes checked: P650, P135 and P102. The guy cleared the codes, the engine light stayed out and all is well. Any ideas - is there one single thing / sensor that might be going bad to cause all 3 of these codes ?

[This message has been edited by PaulJK (edited 07-09-2013).]

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sco77
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Report this Post07-09-2013 09:19 PM Click Here to See the Profile for sco77Click Here to Email sco77Send a Private Message to sco77Edit/Delete MessageReply w/QuoteDirect Link to This Post
Maybe MAF.... 3800 should never have a "hunting idle"

------------------
86 Fiero GT 4spd - (pending L67 swap: VS cam, GenV) Build Progress eta: 8/13
98 GTP - Some mods

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phonedawgz
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Report this Post07-10-2013 12:00 AM Click Here to See the Profile for phonedawgzClick Here to visit phonedawgz's HomePageClick Here to Email phonedawgzSend a Private Message to phonedawgzEdit/Delete MessageReply w/QuoteDirect Link to This Post
OBD2 codes are 4 digit. Assuming the leading zero...


P0102 Mass or Volume Air Flow Circuit Low Input
Perhaps an issue with your MAF wiring?

P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
I don't believe the 99 Grand Prix used PCM controlled O2 heaters.

P0650 Malfunction Indicator Lamp (MIL) Control Circuit Malfunction
But your MIL light appears to be working correct?
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PaulJK
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Report this Post07-10-2013 12:25 AM Click Here to See the Profile for PaulJKSend a Private Message to PaulJKEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by phonedawgz:

OBD2 codes are 4 digit. Assuming the leading zero...


P0102 Mass or Volume Air Flow Circuit Low Input
Perhaps an issue with your MAF wiring?

P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
I don't believe the 99 Grand Prix used PCM controlled O2 heaters.

P0650 Malfunction Indicator Lamp (MIL) Control Circuit Malfunction
But your MIL light appears to be working correct?


yep, those are the codes and descriptions the guy pulled up.

 
quote
Originally posted by phonedawgz:

P0102 Mass or Volume Air Flow Circuit Low Input
Perhaps an issue with your MAF wiring?



i can check the MAF wiring. the sensor is in the large tubing near the air intake canister, correct ?

 
quote
Originally posted by phonedawgz:

P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
I don't believe the 99 Grand Prix used PCM controlled O2 heaters.



i think maybe mine does (?)

 
quote
Originally posted by phonedawgz:

P0650 Malfunction Indicator Lamp (MIL) Control Circuit Malfunction
But your MIL light appears to be working correct?



All i have is a CHECK ENGINE light and it appears to be working correctly. Assuming the MIL = CHECK ENGINE, how would i check the "circuit" ?

[This message has been edited by PaulJK (edited 07-10-2013).]

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IIKool
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Report this Post07-10-2013 07:21 AM Click Here to See the Profile for IIKoolClick Here to Email IIKoolSend a Private Message to IIKoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
I don't think the code PO135 is what you have listed,
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PaulJK
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Report this Post07-11-2013 07:19 PM Click Here to See the Profile for PaulJKSend a Private Message to PaulJKEdit/Delete MessageReply w/QuoteDirect Link to This Post
Engine light went out and car runs great.
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Lou6t4gto
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Report this Post07-12-2013 01:09 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
Isn't the MAF on the side of the Throttle Body on the SC engine ?
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phonedawgz
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Report this Post07-12-2013 09:13 PM Click Here to See the Profile for phonedawgzClick Here to visit phonedawgz's HomePageClick Here to Email phonedawgzSend a Private Message to phonedawgzEdit/Delete MessageReply w/QuoteDirect Link to This Post
That flat black thing on the top of the throttle body.

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