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09-20-2019, 03:39 PM #1
Founding Member
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- Sep 2008
- Name
- Jay
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- 93 Ultra Z
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- Delaware
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Help before I decide to part and sell this car!!!
I need help before I decide to part out this car!! New Opti, New plugs, New Coil, new ICM, new MAP, New IAC.... car starts and runs ok. Then it stumbles and the fans come on. DTC 16 sets. I rev the crap out of the car. SES light turns off and it runs ok again... then it stumbles when the fans coming and DTC 16 sets again.. I swapped opti pigtails too... no change...
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09-20-2019, 05:09 PM #2
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- Mike Storm "Stormy"
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I'll take the driver's seat. Joking. Wouldn't know it's an 93 fought the opti would turn on the fans.
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1995 Trans Am - CAI - TB coolant bypass - Headers & Performance Muffler - Poly mounts - stock LT1/A4 - 13.3 1/4 - 1.9 60 foot , driven daily.
2008 C6 Corvette LS3 Snake charmer Ram Air intake. 6 Speed Switchable mild to wild exhaust.
2002 Silverado LT Extd Cab Z71 5.3 A4 Composite Bed Stock
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09-20-2019, 07:32 PM #3
LTx Guru
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- Fred
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- 1994 Formula - SOLD
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What brand is the “new Opti”?
DTC 16 sets when the ECM doesn’t see the low resolution pulse signal from the cam position sensor in the Opti. Basically, requires the low res pulse signal to be missing for at least two crank revolutions (as determined by counting high resolution pulses) before it sets the code. When that code sets, the ECM shuts down the fuel system. Has to be a very brief, intermittent loss of signal for it to feel like a “stumble”. If it’s running, it’s a “stored” code.
And no other codes? I know 94 and newer doesn’t turn on the SES light for DTC 16. Apparently 93 does???SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.
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09-20-2019, 07:45 PM #4
Founding Member
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- Sep 2008
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- Jay
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- 93 Ultra Z
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- Delaware
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It is a delco. No other codes and when I rev it up the SES goes off. I did find a broken wire and fixed it . Looked like it was arcing on the AC bracket. I totally spaced on the fact the gas is a year old... I'm so frustrated that the car is not running and not thinking clearly
Originally Posted by Injuneer
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