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#1
05-08-2010, 08:28 PM
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SES after changing plugs
hello. i just changed my spark plugs and wires today, and now my service engine soon light is on. the codes are p0108 and p0121. i have gone back and looked at all the wiring and nothing looks out of place.
any input would be most appreciated...
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2001 Grand Prix GT: cat/u-bend/resonator delete, zzp PLOG, Custom Intake, DHP PCM, 1981 Fairmont 6cyl 3 speed 1978 Ford Ranchero GT 302 with a few goodies 
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#2
05-09-2010, 01:41 AM
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Re: SES after changing plugs
P0108 is a MAP sensor issue. High input. Did you mess with the MAP sensor located above the PCV valve on the right side of the UIM plenum or PCV? Remove and re-seat the electrical connector to the MAP sensor to start. Also, make sure the MAP sensor is seated properly in the forked plastic retainer and accordian seal is good.
P0121 is a throttle position sensor (TPS) issue. Remove and re-seat the electrical connector to start. This DTC indicates the TPS is either stuck or the output is skewed.
__________________
'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#3
05-09-2010, 09:54 AM
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MAP sensor question
hello all, i went to inspect my MAP sensor a few minutes ago, and found that it is 2 pieces.... is this normal?
__________________
2001 Grand Prix GT: cat/u-bend/resonator delete, zzp PLOG, Custom Intake, DHP PCM, 1981 Fairmont 6cyl 3 speed 1978 Ford Ranchero GT 302 with a few goodies
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#4
05-09-2010, 11:03 AM
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Re: MAP sensor question
jakegday,
Your two posts on the same issue have been merged together to cut down on confusion and possible redundant replies. The answer to your question is no. Get it replaced.  
__________________
'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#5
05-09-2010, 11:19 AM
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Re: MAP sensor question
Quote:
 Did you lean on that while getting the back plugs?
__________________
-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#6
05-09-2010, 10:13 PM
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Re: SES after changing plugs
lol, must have. a new one fixed the problem. the back plugs are actually ALOT easier then i thought they would be. hardest part of the entire job was pulling the back wires off
funny thing is the sensor was in that exact condition a few months ago when i changed the PCV valve, and it just now set a code..... must have bumped it just right
__________________
2001 Grand Prix GT: cat/u-bend/resonator delete, zzp PLOG, Custom Intake, DHP PCM, 1981 Fairmont 6cyl 3 speed 1978 Ford Ranchero GT 302 with a few goodies
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#7
05-10-2010, 09:55 PM
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Re: SES after changing plugs
The clip that holds the MAP in probably held it together enough to keep the code from tripping. Eventually, it started leaking enough to cause the light to come on. Glad to hear you got it fixed.
__________________
 Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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