That is my method for changing fuel injectors with the upper intake installed.

 

Ran into a minor problem, think I know what happened, need some other (more experienced and knowledgeable) minds to give their opinion:

Took my car out for first time in two month to check it and make sure everything was a 'go' for a nice weekend of driving. Started and idled in garage for 15 min, pulled out, happy, happy, happy, drove two miles up the road, turned around in a parking lot to come home, car stalled. Restarted it, headed home, about a mile down the road the car began to drastically slow and stumble; then there was a enormous explosion under the hood which damned near blew the hood off (no joke). Immediately pushed in the clutch, which stuck on the floor, threw it in neutral, where the shift lever stayed (wouldn't go into another gear), and coasted of the road. Ended my drive with a flatbed tow.

Only other thing to add is that I had disconnected the battery, and the DSC light was on ("slippery road surface", not "DSC OFF").

Let the questions begin.

 

What was the underhood damage from the "explosion"?

 

A couple things, completely blew the boot that connects the blower to UIM. Question is, why?

 

Are you injecting WM?

Sounds sorta like a manifold backfire (NOS style) - but I dunno why that would happen unless you had WM maybe...

Can we get pics?

 

No w/m yet. Pics will follow, but won't show much information. Not trying to be elusive here, really interested in the thought process a problem like this might elicit in others. I think I know what happened, but I could very well be wrong.

 

I dunno man.

 

Fair enough. Mahalo plenty.

 

well it seems that you got a whole lot of unburt fuel in your UIM - but how ?

 

Good question; I'm not sure the unburnt fuel was necessarily *only* in the UIM. Next bit of information: I had just installed Pettit's boost-up pulley and 09 injectors. And yes, the injectors were fully seated in the fuel rail, and I checked extensively for leaks before and after I fired it up for the first time after the changeover. I also pulled the room fuse and did the reset procedure for the ECU, during and after which I confirmed that there were no fuel leaks from the rail or the quick connectors. BTW, I think this was doomed to happen whether I changed the injectors or not. Next question, and don't forget the DSC.

 

Was your Jet Air hose disconnected?

 

Good thought; no. Had a checklist of disassembly/assembly. All hoses and connectors were taped and numbered. Ditto injector connectors.

 

So what is your thoughts on it?

 

I'm not sure my thoughts are reliable. I was hoping to get some objective input, so I don't want to lead anyone elses' process too much. I'll add this: 2004 car with stock exhaust. S/C installed 18 mos ago, run about 2000 trouble free and ecstatic miles since then.

 

I think you have to look at the recently installed injectors - calibration is probably way off and they could be dumping fuel

Do you have an AFR guage ?

 

I have an EFI Dude; as soon as I can I'll post some graphs, but the lamdas looked good. Something else bothered me, though, and that was the retarded timing, as much as 20 degrees. Again, remember the DSC thought the car was on a slippery surface.

 

Slammed throttle shut on ya.... but still wierd that it was in the mani and not the exhaust.... somehow you got reversion?

 

DSC light always comes on when you disconnect the battery - red herring IMO

 

Clogged cat? I don't think the backfire was due to fuel in the UIM; doesn't make sense. I think it started in the exhaust.

 

Agree. Question: How does DSC limit power?

 

why would the dsc think you were on a slippery surface? If you activate the dsc somehow it will retard timing(it will also pull timing during a fuel starvation situation) to pull power to control the traction. Large injectors+ wrong timing=boom? because fuel buildup then the spark came on? Carburetor engines used to do it all the time--blow back--when the timing got wacko.
Now why was the clutch stuck on the floor? Did you blow the clutch? If you blew it and the car was still in gear--was the pcm reading that the tires where slipping and retard the timing on you?
olddragger

 

Could be wrong but i always thought the dsc limits power by closing the throttle and applying the brakes .....

Still think DSC is a red herring anyways ....

 

This thread and the current discussion is 10 x better than any Agatha Christie who-done-it. I'm following along intently.

 

Just a thought, you mentioned a clogged cat. Greg had somthing happen to him when his Cat clogged but not as drastic (boost spike and loss of power. Maybe since you have the bigger crank pully on it was intensified to the point of causing more damage and the point of the timming being so far off, you said -20 rite. It might have fired the motor over backwords instantly. It might have caused damage to your tranny, clutch and probly motor also since it wont start up or even go into gear. Dosnt sound good at all.

 

Just talked to Cam, he said it might be as minor as your clutch exploding. Lets hope.