Unbelievable backfiring
#1
Grabbin My Wankel
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Unbelievable backfiring
After my car starts up it is just fine and then in a few seconds it starts backfiring like crazy. It backfires like every second all in a row bang,bang,bang,bang. It never stops, just keeps going like that. If anyonw knows what this is please tell me.
By the way I have an hks downpipe, highflow cat and apex n1 exhaust.
By the way I have an hks downpipe, highflow cat and apex n1 exhaust.
#2
Call me gramps!
Have you done the basic checks such as checking to see if the MAP sensor (located near the master cylinder, on the firewall) vacuum line blew off? Also, are you getting any check engine lights?
A disconnected MAP can cause massive backfiring and make your car feel as if it is either blown or running extremely poor. A CEL that induces limp mode (such as a OMP going bad) can also cause these symptoms.
A disconnected MAP can cause massive backfiring and make your car feel as if it is either blown or running extremely poor. A CEL that induces limp mode (such as a OMP going bad) can also cause these symptoms.
#6
Call me gramps!
You still have not confirmed if your MAP is connected.
And to reset the ECU, you simply remove the negative terminal. With the ignition off, press the brake pedal for ~30 sec (I usually do it for at least a minute), then reconnect everything.
And to reset the ECU, you simply remove the negative terminal. With the ignition off, press the brake pedal for ~30 sec (I usually do it for at least a minute), then reconnect everything.
#7
I had the same thing happen to me. Sounded like a machine gun.
I had a blown Apex seal. Engine had 88,000 miles.
Sorry to say but it doesn't look good.
Remove the radiator cap - if you have bubbles you have a blown seal.
Super77
I had a blown Apex seal. Engine had 88,000 miles.
Sorry to say but it doesn't look good.
Remove the radiator cap - if you have bubbles you have a blown seal.
Super77
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#8
Nearing Completion...
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I had this happen to me when I swapped ECU's and it had no base map settings whatsoever. My car was apparently running extremelly lean to the point that the manifold began glowing bright red. I doubt that's your problem if you're running stock twins though. I thought I'd mention it anyways.
#10
Racecar - Formula 2000
Blown apex seal will not make bubbles, but a leaky coolant seal sometimes does.
#11
#12
Grabbin My Wankel
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Checked the map sensor, it is all hooked up, reset the ecu, there are no bubbles in my coolant and now the battery has died. I jumped it and the car started, but still back fires
#13
17 second FD
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Have you driven it? Revved it? It sounded exactly the way you are describing it when I flooded my engine and was able to get it started... I just revved it up a little bit to clean up the plugs, and it ran fine again...
#16
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Do you mean bubbles jsut THERE or when you squeeze the radiator hose and see bubbles that means your got a blown seal?
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#18
Rotary Freak
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Also, some1 else suggesting revving you car, you can give it a shot, just dont rev it too high, i would say the best rpm range is 2-3k. I personally do all the testing on 2500rpm. So good luck with diagnosing your car =)
#20
Call me gramps!
Just because you reset the ECU, it doesn't mean it's not still stuck in limp mode. I would suggest pulling codes from your ECU just to make sure nothing is afoul.
#21
This is what happend to my 93 FD a few years back. Had to get a new engine block.
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