very bad noise...

[hardtailcfl]

Cruisin down the interstate and hear an obnoxiously loud bang...similar to a backfire but louder. Typing this from the side of the road as I wait for the towtruck. check engine light is on truck turns over but won't start. Fuses are good and a quick visual inspection didn't reveal anything out of the ordinary. No fluids leaking or oil all over the ground. So worst case scenario or maybe somethin I'm missing??

 

[qbnkiller]

Re: very bad noise...

Does it turn over freely (like a lack of compression) or normal? When this happened, did the truck lose power, or did you slow down out of fear?

 

[hardtailcfl]

Re: very bad noise...

Truck lost power but turns over like it normally does. Fuel pump took a dump maybe?

 

[hardtailcfl]

Re: very bad noise...

I don't have my laptop so I have no idea what code its throwin. The love hate relationship continues....

 

[syclone0209]

Re: very bad noise...

jump the aldl with something and watch and see what code the check engine light flashes after it flashes the normal 12.

 

[syclone0209]

Re: very bad noise...

can you hear the fuel pump prime up when you turn the key to the on position?

 

[hardtailcfl]

Re: very bad noise...

Its really hard to tell if its priming or not bc I'm sitting on the side of the interstate...ground A&B terminal on the aldl correct? Will keys work?

 

[SY2932]

Re: very bad noise...

If you are lucky, your ignition module (part number is 1048-2827) took a dump. That's what happened to me the last time that I had to have my truck towed home after a backfire left me stranded at the bottom of an off ramp...

 

[hardtailcfl]

Re: very bad noise...

Ok rigged up a key chain and jumped the aldl...no codes. It just continually flashes a 12 which is normal. And I'm 99% sure I can hear the fuel pump priming. I fear the worst...it was way too loud of a bang to not be something serious.

 

[hardtailcfl]

Re: very bad noise...

If you are lucky, your ignition module (part number is 1048-2827) took a dump. That's what happened to me the last time that I had to have my truck towed home after a backfire left me stranded at the bottom of an off ramp...

If you are right I will be one VERY happy camper....

 

[SY2932]

Re: very bad noise...

When mine went, the fuel pump was priming and the truck would turn over fine it just wouldn't start. All the fuses were fine. The ignition module opens and closes the injectors to deliver fuel into the engine. If you can at least crank it, you can't be too bad off...

A bad misfire can also take out the MAP sensor by tearing the diaphragm that is inside it. However, I don't know of anyone with a syty that has done it before.

 

[stuckinUT]

Re: very bad noise...

This literally happened to me yesterday. Was pulling away from a stop sign at maybe 1/4 throttle, truck made a very loud backfire and fell on it's face. Wouldn't restart, had to tow it home. The noise was very loud and disturbing. I feared the worst, but there was no fluids leaking and no rod out the pan. The fuel pump primed for the 2 seconds after turning key to on position, and I had pressure at the rail. This morning it started after sitting overnight. I drove it around the block and it died right in front of my house after driving 2 blocks, wouldn't restart.

It was the PerTronix Flame-Thrower ignition module that had about 500 miles on it.:roll: Replaced it with an AC Delco. Fired right up, drove it about 12 miles, no problems.

 

[hardtailcfl]

Re: very bad noise...

This literally happened to me yesterday. Was pulling away from a stop sign at maybe 1/4 throttle, truck made a very loud backfire and fell on it's face. Wouldn't restart, had to tow it home. The noise was very loud and disturbing. I feared the worst, but there was no fluids leaking and no rod out the pan. The fuel pump primed for the 2 seconds after turning key to on position, and I had pressure at the rail. This morning it started after sitting overnight. I drove it around the block and it died right in front of my house after driving 2 blocks, wouldn't restart.

It was the PerTronix Flame-Thrower ignition module that had about 500 miles on it.:roll: Replaced it with an AC Delco. Fired right up, drove it about 12 miles, no problems.

Hmmm...interesting. I'm going to take the cap off the dist tonight and see what I find. Fuel pump definitely primes and engine cranks normally. Not sure about fuel pressure bc I didn't feel like messing with it last night. Going to test the coil too. I read a ton of posts last night and seems to me it 99% has to be something with the ignition. You need 3 things to start right? Air, fuel, and spark. I have air and fuel but no spark...time will tell.

 

[hardtailcfl]

Re: very bad noise...

I also read somewhere that the Duralast ignition module from Autozone has a lifetime warranty. I think SY2932 posted it. Anybody have any good/bad luck with these? The lifetime warranty is pretty hard to pass up...

 

[SY2932]

Re: very bad noise...

I also read somewhere that the Duralast ignition module from Autozone has a lifetime warranty. I think SY2932 posted it. Anybody have any good/bad luck with these? The lifetime warranty is pretty hard to pass up...

Yep, it was me. Most of the major chain stores can check it for you to see if it is bad or not too. I have a Duralast DR140 that I got from Autozone last year when my truck left me stranded. With ignition modules, you MUST use the heat sink grease that comes with them or else they WILL burn up. The contact with the distributor is what keeps them cool during operation.

 

[hardtailcfl]

Re: very bad noise...

Yep, it was me. Most of the major chain stores can check it for you to see if it is bad or not too. I have a Duralast DR140 that I got from Autozone last year when my truck left me stranded. With ignition modules, you MUST use the heat sink grease that comes with them or else they WILL burn up. The contact with the distributor is what keeps them cool during operation.

Awesome...thanks for the quick reply! I'm gonna get it taken apart and see what I find but more than likely I'll end up going this route :tup: