Backfiring from exhaust under load
- Thread starter Huff890
- Start date
Need more info.
How long have you had the car?
Miles?
Originally a V8 car?
Any other modifications?
How long have you had the car?
Miles?
Originally a V8 car?
Any other modifications?
Check the common things, plugs, wires, cap and rotor, fuel pressure, and timing, I would go as far as a compression test.
Codes first:
It's likely in limp mode.
The throttle position sensor is probably bad. Your code check will help to confirm.
It's likely in limp mode.
The throttle position sensor is probably bad. Your code check will help to confirm.
There's a few things that can cause this.
First step: Dump codes. I'd also check fuel pressure and perform a smoke test to check for vacuum leaks. A slipped intake gasket can sometimes cause this. I'd do some basic troubleshooting first before firing off the parts cannon
First step: Dump codes. I'd also check fuel pressure and perform a smoke test to check for vacuum leaks. A slipped intake gasket can sometimes cause this. I'd do some basic troubleshooting first before firing off the parts cannon
Can you run the engine running codes as well? Those will likely be more informative
Wasn’t a valid test.
Do the koeo and cm codes. Once done, start the engine. The idle should go up, display a 4 or 8 and the start spitting out codes shortly after. A pass is code 11. No codes, or no code 11 and it was not done correctly.
Do the koeo and cm codes. Once done, start the engine. The idle should go up, display a 4 or 8 and the start spitting out codes shortly after. A pass is code 11. No codes, or no code 11 and it was not done correctly.
Plus KOEO codes 13 and 33
Code 22: BAP sensor
Code 41: O2 sensor indicates lean (i forget which bank)
Code 44 is the air pump, you can ignore this
Code 33 is the EGR. Wont affect how car is running
Code19 is typically set when your idle speed is set about 725.
Code 19 - Engine off - No Vehicle Power (pins 37 + 57) or bad PCM VPWR Diagnosis. This is a wiring problem that is from a bad ECC power relay, bad connection, bad fuse link or a bad computer. The ECC relay is located on top of the computer under the passenger side kick panel. Pull the connector off any fuel injector and measure the voltage on the red wire: if its 12 volts or better, the ECC relay is OK. If the ECC relay is OK, pull the kick panel off and measure the voltage at pins 37 & 57. If it is 12 volts or more, then the computer's diagnostic firmware has taken a dump and is defective.
These ECU’s are known for the internal capacitors going bad. They can be repaired. Some diyers have been successful at repairing them. I tried but it didn’t work for me. I then sent it in to an exchange service. You send yours in and they either repair it or send you another that’s been repaired. I’ve had good luck with this service. So, “if” it’s your ECU acting up you could consider this path
A9L A9P C3W A3M X3Z MUSTANG ECU PCM COMPUTER REPAIR SERVICE 5.0 REPAIR & RETURN | eBay
Mustang ECU Repair Service. Quick turn around after the computer is received. Easy repair process. If we are unable to repair your computer, WE CAN HELP! 701 La Veta Dr. Crank, no start?.
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