I have what u call...A PROBLEM!
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Supreme Member
Joined: Oct 1999
Posts: 2,977
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From: Davison / Troy ,Michigan
Car: 1991 Pontiac Firebird
Engine: 3.8
Transmission: 700r4
Axle/Gears: Dana 60
I have what u call...A PROBLEM!
Went to go time my car tonight with the G-tech and these problems happened.
#1. Lined my car up, went to floor it and I saw an explosion of fire inside my open element and the car instantly stalled out. But it started right back up and ran like it did before, but it has been doing that on and off lately and its only when I floor it or give it 3/4 throttle from idle.
#2. Lately I have also been hearing a ringing at idle. Maybe it rings at higher speeds but I can't tell because of my exaust noise.
#3. When I am G-teching the car, it seems to loose power at around 45mph. I am thinking maybe my fuel pressure needs to be boosted because there is more air coming in that 14x3 open element from my ram air hood, but its just a guess.
SOOOO...these are my problems. Is my timing bad one way or the other? Thats my guess. I would go in the garage and check my plugs but the garage is full right now.
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Eric Natzke
91 Firebird 305 TBI
"It Ain't Stock"
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html
#1. Lined my car up, went to floor it and I saw an explosion of fire inside my open element and the car instantly stalled out. But it started right back up and ran like it did before, but it has been doing that on and off lately and its only when I floor it or give it 3/4 throttle from idle.
#2. Lately I have also been hearing a ringing at idle. Maybe it rings at higher speeds but I can't tell because of my exaust noise.
#3. When I am G-teching the car, it seems to loose power at around 45mph. I am thinking maybe my fuel pressure needs to be boosted because there is more air coming in that 14x3 open element from my ram air hood, but its just a guess.
SOOOO...these are my problems. Is my timing bad one way or the other? Thats my guess. I would go in the garage and check my plugs but the garage is full right now.
------------------
Eric Natzke
91 Firebird 305 TBI
"It Ain't Stock"
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html
TGO Supporter
Joined: Aug 1999
Posts: 14,811
Likes: 1
From: Jackson County
making sure you have a good tune up might be a place to start and knowing the timing is correct is always a good thing.
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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM
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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM
Supreme Member
Joined: Jul 1999
Posts: 1,405
Likes: 1
From: USA
Car: 1988 IROC-Z
Engine: 5.7L TPI
Transmission: 700R4
Axle/Gears: BW 2.77
I am going to tell you something that someone told me and I got pissed off ... check that firing order.
How in the hell could I get the firing order out? Well, apparently, I had 5 and 7 crossed so there. Was losing power at 45 and was getting backfire at heavy throttle. Sounds kind of similar, but most forget the simple things to check for. I did.
And yes, base timing is always a good start too!
How in the hell could I get the firing order out? Well, apparently, I had 5 and 7 crossed so there. Was losing power at 45 and was getting backfire at heavy throttle. Sounds kind of similar, but most forget the simple things to check for. I did.
And yes, base timing is always a good start too!
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Joined: Jan 2000
Posts: 19,684
Likes: 317
91,
Your little explosion sounds like lean backfire. Verify the timing. Check fuel pressure and flow.
Make sure the MAP can handle the higher absolute pressure from the RA hood, and that the ECM fuel map is tuned for a higher MAP reading.
And as Ed and Allan point out, don't overlook the obvious.
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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader
Your little explosion sounds like lean backfire. Verify the timing. Check fuel pressure and flow.
Make sure the MAP can handle the higher absolute pressure from the RA hood, and that the ECM fuel map is tuned for a higher MAP reading.
And as Ed and Allan point out, don't overlook the obvious.
------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader
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