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Old 02-16-2013, 08:45 PM   #1
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1998 Camaro 3800 Starts and shuts right off

I bought a 98 Camaro with a blown motor. I picked up another engine and went through it and installed it. When I attempt to start it, it will run for about two seconds and shut right off. No matter how many times I try it will do the same thing over and over. Here is a list of the details:

1. I checked the key at the dealership, they said that it was good and it matched the vin code
2. I changed the oil pressure sensor ($38), oil guage jumps to 60 during crank.
3. Security light comes on and then shuts OFF
4.The digital screen for mileage etc. is completely darkened (may or may not be related to the no start issue)
5. I can hear the fuel pump prime before start and fuel rail is purged and pressurized (I do not have a gauge to measure the exact pressure)
6. Definitely have spark
7. Computer codes in memory: P1635 NO DTC Definition, P0122 Throttle pedal position sensor
8. I re-wrapped the entire wiring harness so loose wires are not likely.

Next I intend to change the Crank Shaft Position Sensor other than that I'm thinking a bad computer?
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Old 02-16-2013, 09:44 PM   #2
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Most likely you need the computer that went with the engine.
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Old 02-17-2013, 01:31 AM   #3
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P0122 indicates your TPS isn't working. That will shut the car off for sure.

Make sure your throttle position sensor is good, or even hooked up. Make sure there isn't any corrosion in the connections as well. Same for the PCM, make sure the ground connections are clean and free of corrosion.

Did you install another engine with a cable throttle body or switch over the intake manifold?

Also check to make sure the MAF sensor is connected correctly and also clean.
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Old 02-19-2013, 02:48 PM   #4
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I had this happen on my 3.8 randomly one time. After a few attempts I disconnected the battery and left it for a few hours. When I returned I hooked the battery back up and it's never happened again....It's been 4+ years since this happened.
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Old 02-20-2013, 11:45 AM   #5
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All these seuggestions are good. Check those. But also it could be a clogged fuel filter. Something to check into
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Old 02-20-2013, 12:38 PM   #6
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Google is your friend:
DTC P1635

The 5 volt reference circuit provides a signal voltage to the linear EGR, MAP sensor, and TP sensor. The return line is grounded through the PCM. DTC P1635 detects a short to ground in any of the 3, 5 volt reference circuits or inside the PCM.
Conditions for Setting the DTC
Important
The 5 volt reference is monitored whenever the ignition is ON.

DTC P1635 will set if the 5 volt reference signal is below 3.5 volts or above 5.5 volts. This voltage is monitored internally by the PCM.
Diagnostic Aids
If DTCs P0563, P0108, P1106, P0452, P0453, P1122, or P0122 are set, a short to B+ on the 5 volt reference circuit is probable. If the short exists while attempting to diagnose, PDT communications will be lost and driveability conditions will exist.
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Old 02-25-2013, 03:49 PM   #7
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Update: I replaced the TPS, No change in condition.
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Old 02-25-2013, 04:15 PM   #8
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Also, this may or may not contribute to the condition, I have one extra plug without a home. It has two wires, purple and tan and it is the last branch before the EGR valve.
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Old 02-25-2013, 05:21 PM   #9
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I found the plug, inlet air temp. No change in condition
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Old 02-25-2013, 07:26 PM   #10
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Changed fuel filter, no change.
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Old 02-28-2013, 05:12 AM   #11
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Spark plugs? Maf sensor or map sensor?
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Old 02-28-2013, 10:25 PM   #12
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I pulled the crankshaft position sensor, there is a respectable crack in the resin behind the magnetic surface. I have a new one on order it should be here next week. Hopefully that will be the solution.
Thanks for all the suggestions.
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Old 03-06-2013, 09:59 PM   #13
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OK, I have changed both the crankshaft position sensor and the oil level sensor. It still shuts off almost instantly. I will hunt down a new computer next week. Other than that, I may just start parting it out.
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Old 03-08-2013, 10:55 AM   #14
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Quote:
Originally Posted by SalvageSteve View Post
OK, I have changed both the crankshaft position sensor and the oil level sensor. It still shuts off almost instantly. I will hunt down a new computer next week. Other than that, I may just start parting it out.
ill sell you a computer for 50+ shipping. its for a 98 3.8 w/ t5
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oh! And some tacky mother****er with a green 05 or 06 V6 Stang on some 22's" on the corner of my block. **** that dude.
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Old 03-18-2013, 07:12 PM   #15
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Ok, The fuel pump has been changed. Now it starts less then before, but when it does start it still shuts right off.
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Old 03-19-2013, 08:08 PM   #16
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I tried a different computer today, it would not fire the engine at all. I re-installed the old computer and it returned to the same start and die condition I'm running out of things to replace.
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Old 03-20-2013, 02:03 PM   #17
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Quote:
Originally Posted by SalvageSteve View Post
I tried a different computer today, it would not fire the engine at all. I re-installed the old computer and it returned to the same start and die condition I'm running out of things to replace.
pull an injector and see if its getting gas
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oh! And some tacky mother****er with a green 05 or 06 V6 Stang on some 22's" on the corner of my block. **** that dude.
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Old 03-20-2013, 02:14 PM   #18
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MAF sensor.
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Old 03-20-2013, 04:54 PM   #19
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You can disconnect the MAF and start it. If it doesn't die then you need a new MAF
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Old 03-20-2013, 06:07 PM   #20
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MAF sensor.
This.
Wasn't the MAF suggested a few posts back?
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