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Fuel system breakthrough!!; Runs great with fuel pump disconnected
Topic Started: Oct 4 2012, 04:17 PM (1,747 Views)
triketrash
Vince
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well Actually starscream I think what I actually did was strip the threads in the throttle body- I already replaced the stock screws with some bolts-
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triketrash
Vince
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well I intalled my new fuel injector today with high hopes, but unfortunately it didn't change a thing. I'm kind of stumped at this point. Can anyone tell me, when the ignition is turned on in your metro, do you get a pretty healthy sized squirt of raw fuel shot into the throttle body with a cold engine? thanks, Vinced
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poorman1


no
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mattmac_69
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Member
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I second the oring idea, did the new injector come with a new oring? I just had the exact thing happen to me, unfortunately I caused the issue. I swapped in a diff injector, but while doing that I pinched the oring and even managed to slightly buckle the caged screen filter thingy on top of the oring. I swapped the screen from my orig injector to the test injector and put oring back on...no more gas running after engine off.
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triketrash
Vince
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hi mattmac- yes the new injector came with new o-rings at the tip and the one about half way up the body- again I don't believe fuel is leaking past the o-ring, but is spraying out of the injector when you first turn the key. I'm wondering if this is just a normal priming feature.
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clarkdw


No not normal. pm replied to.
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Shinrin
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Could be a stuck relay, causing it to keep firing?
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clarkdw


Shinrin
Oct 13 2012, 01:33 AM
Could be a stuck relay, causing it to keep firing?
No. Relay supplies voltage to the injector whenever the key is on. It is just not grounded which comes through the ECM.

For the injector to be energized all the time requires a wire grounded that shouldn't be or a fault in the ECM allowing the injector to be grounded.
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triketrash
Vince
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today, using clarkdw's recent advice, I unplugged the injector at the throttle body connection and, low and behold, there was no longer fuel squirting into the TB when ignition was turned on, thus, ruling out a problem with the injector, or a leak past the injector at one of the o-rings. I wanted to first have a look at the wires that lead from the plug up to the injector cap so I removed the plate on top of the TB that covers the groove in which they reside. I slid the heat covering back to have a look at both ends- everything looked OK so I set the wires back in the groove. Then, just for giggles, I plugged the connection back in at the throttle body, and cycled the ignition again- no big squirt of gas this time- the ah ha moment - got in the car, and it FIRED RIGHT UP!!!. So I know now where the problem is, but can't see anything obviously wrong with the wiring. Apparently, there must be somewhere where the wires were grounding, thus energizing the injector. For the time being, I guess I could resort to wiggling the wires if there's more trouble, but I would really like to pinpoint the exact problem. Thanks very much to everyone for your brainstorming.
Edited by triketrash, Oct 13 2012, 09:18 PM.
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triketrash
Vince
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/Users/home/Desktop/iPhoto Library/Originals/2012/Oct 13, 2012/1013121539-1.jpg

here's the wires that I jiggled and the injector stopped with the squirt action at key-on
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Scoobs
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:D

Picture didnt work, you need to use a file sharing site, like photobucket.
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sslinkyy
Fresh Fish
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Hey all! I had this same problem on a few vehicles I have fixed. Every time it was a bad ecm. gasoline in the crankcase is most likely the reason why the car still ran with the fuses out. Hope this helps!
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wizard 03


Glad to see you found the problem, I hate to tell you this, but to me, it sounds like bad wireing.

Sadly, you need to familerize yourself with chaseing down a single wire from one source to the next. To me, it sounds like a straight short. Either it has rubbed up against something metalic, a connector has corroded to the point it is grounding the wire out, or someone spliced into it.

Start looking for the obviouse. Has anyone installed an aftermarket something such as a stereo or drilled a hole for a power wire to go through?
How about the connectors? Are they ugly green and corroded? How about any moisture?

If nothing is obviouse, you will have to trace the wire down all the way to the source.



Good news is I was correct. There was nothing wrong with the engine itself. It was something that was on the car that caused problems.
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starscream5000
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Got 70 MPG?

sslinkyy
Nov 14 2012, 01:32 AM
Hey all! I had this same problem on a few vehicles I have fixed. Every time it was a bad ecm. gasoline in the crankcase is most likely the reason why the car still ran with the fuses out. Hope this helps!
Very doubtful it's the ECM on these cars. They are not a common failure point in this application. Nevertheless, the problem was found already.
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