suprsiz3_ls1

iTrader: (11)

Last night I went to the dragstrip. The good news is I run a 7.60 with a 1.668 60 foot, but now my car wont run. On my fourth run (while spraying 100 shot) the car started to backfire, and the lid blew off (the metal straps come undone but nothing was damanged). So I let the car sit, then run it again and that's when I run a 7.60. So after that exciting run I waited about 5-10 min and returned to the pits. On my last run It backfired and then the car died. There are no leaks, the engine still turns over normally and it's NOT freespinning. I checked all the fuses, and all seemed to be ok, but when we pulled one of the wires to check the spark(fire) I had no spark. There is a video of the run where the car died below, whats going on?

http://s188.photobucket.com/albums/z...ent=nathan.flv

02 ss convert

iTrader: (1)

If you have access to a set of noid lights for checking injector pulse great,if not hook a small test light or bulb up across one of the fuel injectors and crank it over.The light should flash,if it does not you most likely have a bad crank sensor,reluctor or the circuit back to the computer.If it has injector pulse,then you most likelly have a quad driver failure in the processor or a power or ground problem for that firing circuit.These would require a wiring diagram and lots of time to do pin outs.Good luck

eallanboggs

iTrader: (1)

When you say no spark do you mean "NO" spark or "no" spark? Do you have spark on any cylinders. You've got an odd bank and an even bank. That's your starting point for spark. If you have no spark on either bank you have to suspect something in common like the crank sensor. You have to narrow this down more. You can check individual injectors, but why not do a fuel pressure check to see if you have fuel at the rails? I'd find spark before I worried about fuel. You need to be able to stop before you can go. That's why brakes are more important than your engine unless you have a parachute.

suprsiz3_ls1

iTrader: (11)

thanks, I have been leaning towards the crank position sensor being the problem. Thanks for you time and knowledge..

suprsiz3_ls1

iTrader: (11)

any other opinions?

suprsiz3_ls1

iTrader: (11)

My friend works at a chevrolet dealership, and he put a scan tool on my car, He thinks the maf sensor is bad b/c all the codes relate back to the maf sensor. The codes were:
P0101
P0102
P0128
P0132
P0155
P0300
P0335
P1135
P1153
P1637
could the maf sensor not working cause the car not to have spark(fire)? What Maf sensor should I buy, my car was tuned with a Granatelli Motor Sports Mass Airflow Sensor, so what sensor should I buy?

mvvette97

iTrader: (18)

the backfire probably damaged the MAF but that will NOT make it not have fire. Not sure how but you need to check to see if you have power to the coils.

eallanboggs

iTrader: (1)

mvvette97 makes a valid point. It might not idle properly and have some other drivability issues, but that won't kill your spark. If you have no spark on either bank you have a limited number of things to check. You can take out the spark plugs and spin the crank manually while backprobing the crank sensor to watch for an output.

suprsiz3_ls1

iTrader: (11)

thanks for the info

eallanboggs

iTrader: (1)

A schematic would be very helpful here. You can also check for Vcc at the connector. It's probably 5Vdc, but you need a schematic to be sure. One wire is the ref. voltage and another is the sense line you're going to monitor while spinning the crank. You could do it manually or have an assistant turn the key switch for you. You should first look for Vcc.(you can open the connector to do this check or backprobe it, but do it KOEO). There is no sense going further if you don't have the ref. voltage. Then you can check for sensor output.

suprsiz3_ls1

iTrader: (11)

It was the maf sensor. I had a buddy with another camaro come over and I took his maf sensor off his car and put mine. My car started instantly when I cranked it over. So the lesson that I learned, is if the maf sensor goes bad it can cause the computer not to send spark to the engine. wow???

eallanboggs

iTrader: (1)

I don't buy it. I just replaced a defective MAF on a Silverado and it had NO spark issues. It did have a MAF DTC. The only driveability was inconsistent idle, but other than that you wouldn't know the MAF was defective. The MAF which also serves as the IAT is an input to the PCM. What makes you think the PCM disables the coil packs if you have a defective MAF?