Had a fire in my blazer today
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Joined: Feb 2005
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Car: 1988 Chevy silverado K5
Engine: 350 bored .030, crane cams hyd bluprint l-79 cam 447 lift 272 dur, camel hump heads port and polished 1.94 1.50, afterburner headers and y pipe, holley 670 cfm tbi, holley projection dual plane manifold, accel high pressure fuel pump, 3 inch exhaust
Transmission: 700 r4 with corvette servo and shift kit.
Had a fire in my blazer today
My tbi to air filter gasket lit up like a candle wick and was burning my k and n and about 10 secs after I put it out my tbi dumped a stream of fuel from both injectors... I got SOOO lucky.
Any ideas as to why this could happen? I have been trying to figure out why my injectors do that. About 30 secs after I shut the motor off I'll hear a gurguling (sp?) and then fuel will just dump out of the injectors. Also when a motor back fires through the tbi that means advanced right?
Any ideas as to why this could happen? I have been trying to figure out why my injectors do that. About 30 secs after I shut the motor off I'll hear a gurguling (sp?) and then fuel will just dump out of the injectors. Also when a motor back fires through the tbi that means advanced right?
Last edited by Blazin4x4; Oct 7, 2006 at 10:04 PM.
Thread Starter
Member
Joined: Feb 2005
Posts: 197
Likes: 0
Car: 1988 Chevy silverado K5
Engine: 350 bored .030, crane cams hyd bluprint l-79 cam 447 lift 272 dur, camel hump heads port and polished 1.94 1.50, afterburner headers and y pipe, holley 670 cfm tbi, holley projection dual plane manifold, accel high pressure fuel pump, 3 inch exhaust
Transmission: 700 r4 with corvette servo and shift kit.
6 degrees advanced as far as I know. Haven't checked it lately because usually I have no one to check it or keep the motor running while I do. Probably need to get button starter setup for just that.
But I am alot more concerned about my injectors literally streaming fuel into the motor after shut off. I hear a gurgling sound and then it just pisses fuel into the manifold... injectors are damn near brand new and the orings have no reason to be bad. I don't know if it does this during startup or while its running but I would assume so. Could this be bad wiring or ecm?
But I am alot more concerned about my injectors literally streaming fuel into the motor after shut off. I hear a gurgling sound and then it just pisses fuel into the manifold... injectors are damn near brand new and the orings have no reason to be bad. I don't know if it does this during startup or while its running but I would assume so. Could this be bad wiring or ecm?
Last edited by Blazin4x4; Oct 8, 2006 at 05:13 PM.
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Joined: Sep 1999
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From: Philly, PA
Well, I think you just figured out the reason they call them "blazers." Little extra fuel at the wrong time...... and you eventually get a real "blazer."
When you turn the key off those injectors should be closed. I can't imagine why they would not be unless there is something wrong with them or maybe some bizarre electrical gremlin causing them to open.
When you turn the key off those injectors should be closed. I can't imagine why they would not be unless there is something wrong with them or maybe some bizarre electrical gremlin causing them to open.
Thread Starter
Member
Joined: Feb 2005
Posts: 197
Likes: 0
Car: 1988 Chevy silverado K5
Engine: 350 bored .030, crane cams hyd bluprint l-79 cam 447 lift 272 dur, camel hump heads port and polished 1.94 1.50, afterburner headers and y pipe, holley 670 cfm tbi, holley projection dual plane manifold, accel high pressure fuel pump, 3 inch exhaust
Transmission: 700 r4 with corvette servo and shift kit.
I just bought the injectors thinking my old ones were bad because of this same problem... and my "old" ones were a few months old. I'm completly stumped and nobody seems to have had this happen to them...
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Disconnect one of the injector connectors. Start the engine and let it run for a minute (probably need to work at keeping it running).
Shut engine off and observe injectors: do they both leak fuel? Or, just the one still connected to the ECM?
If both still leak fuel I would put a fuel pressure gauge on and repeat the test. While observing the fuel pressure.
If only the still connected injector leaks fuel I would suspect a bad ECM.
Another test: with the engine off, hot wire the fuel pump on. Usually there is a test lead to assist. Observe the injectors, any fuel at all and there is an issue.
Also a good time to check the fuel pressure. Should be between 9 & 13 psi if stock.
RBob.
Shut engine off and observe injectors: do they both leak fuel? Or, just the one still connected to the ECM?
If both still leak fuel I would put a fuel pressure gauge on and repeat the test. While observing the fuel pressure.
If only the still connected injector leaks fuel I would suspect a bad ECM.
Another test: with the engine off, hot wire the fuel pump on. Usually there is a test lead to assist. Observe the injectors, any fuel at all and there is an issue.
Also a good time to check the fuel pressure. Should be between 9 & 13 psi if stock.
RBob.
Thread Starter
Member
Joined: Feb 2005
Posts: 197
Likes: 0
Car: 1988 Chevy silverado K5
Engine: 350 bored .030, crane cams hyd bluprint l-79 cam 447 lift 272 dur, camel hump heads port and polished 1.94 1.50, afterburner headers and y pipe, holley 670 cfm tbi, holley projection dual plane manifold, accel high pressure fuel pump, 3 inch exhaust
Transmission: 700 r4 with corvette servo and shift kit.
Good advice... seems about par for the course. I'll give it a shot... hopefully no fires this time.
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