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07-08-2012, 09:15 PM
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#1
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Join Date: Jan 2012
Location: north jersey!
Posts: 87
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inconsistent idle, throwing codes for MAF and TPS
motor is an lt1 with cc306, fresh rebuilt, new o2 sensors
the car does not idle on its own soon as it starts, need to give it a little gas for a few seconds then it idles on its own around 1500 then could drop to 1000 or stall or even jump to 2000. the tps code gets thrown with car off key on, maf code doesnt come on until car is running. i dont usually throw parts at a car and hope it works but i replaced the tps and problem still occurs. i oblonged the holes on the tps but im a noob when it comes to ohm meters(need help) so i am not sure if it is set properly
Codes:
p0122- throttle/pedal position, sensor A, circuit low input
p0100- mass or volume air flow circuit
also is throwing this code.
p1657GM- skip shift 1-4 upshift.
i been researching for days but have been coming up with next to nothing,
thanks in advance
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07-08-2012, 09:32 PM
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#2
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Join Date: Jun 2011
Location: Manahawkin New Jersey
Posts: 608
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Im having the same codes coming up on my new motor though mine is idling ok. Im taking it to tunetime next week in hopes that i can fix these issues. Please keep me informed and i will do the same
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07-09-2012, 06:25 AM
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#3
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Join Date: Jan 2012
Location: north jersey!
Posts: 87
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Quote:
Originally Posted by bigz28man
Im having the same codes coming up on my new motor though mine is idling ok. Im taking it to tunetime next week in hopes that i can fix these issues. Please keep me informed and i will do the same
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will do , thanks
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07-09-2012, 07:06 AM
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#4
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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It should be the blue wire you need to test on the tps. You probe it with a volt meter and read the voltage key on engine off. Set it to .67. Then clear the light and see if the maf code comes back. I think the skip shift needs a resistor wired in, google skip shift eliminator.
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07-09-2012, 10:18 AM
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#5
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by Coreylt1
motor is an lt1 with cc306, fresh rebuilt, new o2 sensors
the car does not idle on its own soon as it starts, need to give it a little gas for a few seconds then it idles on its own around 1500 then could drop to 1000 or stall or even jump to 2000. the tps code gets thrown with car off key on, maf code doesnt come on until car is running. i dont usually throw parts at a car and hope it works but i replaced the tps and problem still occurs. i oblonged the holes on the tps but im a noob when it comes to ohm meters(need help) so i am not sure if it is set properly
Codes:
p0122- throttle/pedal position, sensor A, circuit low input
p0100- mass or volume air flow circuit
also is throwing this code.
p1657GM- skip shift 1-4 upshift.
i been researching for days but have been coming up with next to nothing,
thanks in advance
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Stupid question, but did you check your wiring connections and make sure you are getting voltage?
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07-09-2012, 03:03 PM
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#6
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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I assume the car has a mail order tune for the cam?
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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07-09-2012, 10:35 PM
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#7
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Join Date: Jan 2012
Location: north jersey!
Posts: 87
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Quote:
Originally Posted by LTb1ow
I assume the car has a mail order tune for the cam?
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pcm for less tune.
can someone school me on how to test wires? today i tried testing the tps with the ohm meter, i put it on the sensor itself on black and blue pins. i got it set to 2.66 but i am not confident with my electrical skills yet but im dying to learn
also checked engine sens fuse. unplugged the fuse and still popped up the same codes. i figured more would pop up. then i un plugged maf, tps, iat and turned key on to trip codes, then erased them, key off, plugged back in, and tried again. did not change anything
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07-09-2012, 10:47 PM
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#8
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Join Date: Jan 2012
Location: north jersey!
Posts: 87
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Quote:
Originally Posted by WildBillyT
Stupid question, but did you check your wiring connections and make sure you are getting voltage?
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can you explain how to check please? newbie to electrical testing
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07-10-2012, 07:06 AM
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#9
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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The tps sensor must be plugged in. You only want to probe the signal wire, it should be the blue one. You can use a fine pin or paperclip if your multimeter has large pins on the leads. Set it to your lower voltage setting. With the key on and engine off, you want to set the tps at .67 volts. Then have someone slowly depress the gas pedal and watch that the voltage smoothly increases. At wide open throttle, you should have over 4 volts, should be about 4.5 volts.
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07-10-2012, 10:18 PM
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#10
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Join Date: Jan 2012
Location: north jersey!
Posts: 87
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Quote:
Originally Posted by sweetbmxrider
The tps sensor must be plugged in. You only want to probe the signal wire, it should be the blue one. You can use a fine pin or paperclip if your multimeter has large pins on the leads. Set it to your lower voltage setting. With the key on and engine off, you want to set the tps at .67 volts. Then have someone slowly depress the gas pedal and watch that the voltage smoothly increases. At wide open throttle, you should have over 4 volts, should be about 4.5 volts.
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perfect. thank you very much i will do this tomorrow
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