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Old 04-19-2010, 10:04 PM   #1
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Off idle stumble/hesitation, Intake backfire @ WOT

Hi all,
I'm stumped at the moment. I am trying to troubleshoot this problem but have hit a road block on where to turn next. Car idles smooth, drives fine but when you hit the throttle at idle it hesitates then revs fine. If you go WOT off idle it backfires through the intake once. While cruising, going WOT it will backfire once through the intake and appear to run fine. I've attached a log of a run and it looks like the left side leans out. Rec #'s 4492,5328 & 5754 are just before it backfires when going WOT on the freeway. At the end of the file, 3-4 times at idle I hit the throttle and it hesitates. What I have tried so far is plugs, checked wires, opti is new but not replaced for this problem, fuel pressure checks out, compression looks good (within 10 psi) and I have checked for vacuum leaks and cannot find any. This is the LT1 in my 69. All emissions deleted, mostly stock tune from a Corvette. If anyone has time and can look at the log and give me some more suggestions I would appreciate it.
Thanks
Brian

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1997 Camaro SS clone M6(conversion) 3.42 Gears-Selling
1969 Camaro 94 LT1 A4 (4l60e) 3.36 gears
2010 Camaro 2SS/RS 6spd
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Old 04-20-2010, 05:27 AM   #2
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"Download Error - This File Has Been Deleted."
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Fred

94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
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Old 04-20-2010, 05:48 AM   #3
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Odd. I just downloaded it again from another computer. Can you please try again?
If that one still doesn't work, try this one.




http://rapidshare.com/files/37825449..._run2.csv.html

Maybe this one will work. :/
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1997 Camaro SS clone M6(conversion) 3.42 Gears-Selling
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2010 Camaro 2SS/RS 6spd

Last edited by briand069; 04-21-2010 at 10:36 AM. Reason: added link
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Old 04-20-2010, 07:27 AM   #4
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I have recently developed the same problem. Adjusted throttle body for split BLM's and it got worse.
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Old 04-20-2010, 02:12 PM   #5
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Quote:
Originally Posted by briand069 View Post
Odd. I just downloaded it again from another computer. Can you please try again?
If that one still doesn't work, try this one.
In your post "this one" is a box with a red X in it.
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Fred

94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
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Old 04-20-2010, 09:03 PM   #6
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Well, I'm not sure what to try next for uploads. I can click on both links and download the file though. If they don't work what else can I try to host the file?
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Old 04-21-2010, 11:02 AM   #7
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If someone wouldn't mind, can you please see if this link works.

http://www.mediafire.com/?zcwyt5zkzwt

Thank
Brian
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Old 04-21-2010, 05:51 PM   #8
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It downloaded. Almost gave up when I clicked "download" and it popped up a hotjobs sign-in screen.

Huge file, will be a while before I can get to it.
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94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
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Old 04-21-2010, 05:55 PM   #9
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Right on. Sorry about all the trouble posting the file. Most of the issues occur around the record numbers I listed but it you see something else let me know.

Thanks
Brian
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Old 04-24-2010, 05:23 PM   #10
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Ttt
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Old 04-24-2010, 06:45 PM   #11
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Mine went away when I pulled the coil wire, put some dielectrical grease on both ends and turned the throttle body screw out about 1/2 turn.
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Old 04-28-2010, 02:34 PM   #12
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Well, I seem to have finally figured, well fixed at least, my troubles. After rechecking everything mechanical electrical I wet back to the tune. I had tried several different F-body bins and all resulted in the same hesitation/backfire trouble. The PCM I have came from a 94 Vette with the $EEB file but I could never get it to work because I didn't have the CCM. But, after downloading the most recent Tunercat I saw they added a option "Data stream fuel enable". So I reloaded my original tune with that option unchecked and low and behold it worked. I've read that loading the different bins shouldn't matter but for what ever reason mine seems to like the $EEB tune. Go figure.

Brian
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1969 Camaro 94 LT1 A4 (4l60e) 3.36 gears
2010 Camaro 2SS/RS 6spd
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Old 04-28-2010, 02:49 PM   #13
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my 94 z28 does the same thing...... i dont think it has ever not done it... i have just assumed it was because of the cam and because of the 2500 stall tq converter.
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Old 04-28-2010, 02:49 PM
 
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