2000 corvette going into safe mode

**scarolina** · 01-04-2013, 01:01 PM

My 2000 corvette has 3 inch long tube headers, off road x pipe, and no cats. While driving down the road or starting off from a stop light the car will suddenly go into safe mode and not want to run no matter how much gas I give or anything. I have already replaced the plugs, triple checked the gapping, changed the plug wires, air filter, fuel filter, checked the coil packs, did a compression test on all cylinders, replaced the front o2 sensors, checked for any air leaks, cleaned the maf sensor. Can not fix problem. Im getting these codes when I read it out PO174; PO152; PO131; PO132; PO300. Any help would be awesome. Could it possibly be a bad accelerator pedal sensor??? Or a bad ECU needing to be reproggramed from having no Cats on the car??? Car wont even sit in driveway and idle properly. Wants to stall.

**FinZ28** · 01-04-2013, 04:46 PM

Looks like you have a misfire condition going on. Might want to check for a vacuum leak under the hood. I had one awhile back on my Z28 which was caused by a hole in my PCV system pulling unmetered air into the engine. It was loud enough I could hear it. Is your check engine light flashing any?

**cammed goat** · 01-04-2013, 06:24 PM

Was the car tuned after the modifications?

**scarolina** · 01-05-2013, 09:05 AM

No the car was not tuned after the modifications. Ran into some money problems afterwards and havent gotten them done yet. Now this started right before I was going to get the tune. Yes my check engine light is on and those codes that I put into the thread is what I got from reading it out with an OBDII. I checked for vacuum leaks once already and found one at the Maf sensor but fixed it and problem still exists.

**cammed goat** · 01-05-2013, 06:29 PM

Okay. Have you checked the intake tube for any cracks/tears? If you have any tears in the intake bellows, that could be the culprit. Also, how many miles are on the car? Is the throttlebody on your car drive-by-wire?

**FinZ28** · 01-05-2013, 08:34 PM

I would also check your PCV system out, as well. If there is a crack or hole in it you're pulling in unmetered air, which will cause your car to run lean and misfire.

**scarolina** · 01-06-2013, 11:19 AM

It has 77,000 miles on it.

**cammed goat** · 01-06-2013, 05:58 PM

I'm trying to remember if yours has the drive-by-wire throttlebody. Back when I used to post on a GTO-based forum, years ago, the LS2 GTOs had limp-mode issues that were electronic throttlebody related.

**robs98mysticZ** · 01-06-2013, 07:14 PM

Originally Posted by cammed goat

I'm trying to remember if yours has the drive-by-wire throttlebody. Back when I used to post on a GTO-based forum, years ago, the LS2 GTOs had limp-mode issues that were electronic throttlebody related.

its a 00' so dbw tb not elec.

**Spaz** · 01-10-2013, 05:37 AM

is the maf wire plugged back in??? check all the wires...

**0rion** · 01-10-2013, 07:55 AM

have you checked for a melted wire on the headers? Also...verify fuel pressure at the rail. 3 out of 5 codes there are O2 codes. If you've replaced the sensors I would then look at the harness. Any exhaust leaks pre O2 sensor?