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Weird AFR dips between shifts, ideas? OBD1/Crome

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Weird AFR dips between shifts, ideas? OBD1/Crome

Old 04-30-2005, 09:28 PM
  #1  
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Default Weird AFR dips between shifts, ideas? OBD1/Crome

So my car has been running a perfect 11.8-12:1 AFR in WOT, never had any troubles.

Until last night at the drag strip

between each shift, when i got back onto the throttle, it would hesitate for a split second. Lucky for me I datalogged the passes.

For whatever reason, that hesitation is a dip in the AFR's to almost dead on 10:1 (sometimes 10.5 or 10.9:1) but I can tell its holding me back pretty badly.

Question 1: Could this be a symptom of a blown headgasket, I've been wondering if I've lost that cause I have a coolant leak and I cant find a dripping hose, just losing coolant and I can see it on the undercarriage. I plan on doing the ARP's and a new HG as soon as I can (money $$ )

Question 2: my clutch was slipping pretty bad too, could it be a side effect of that?

Car still idles normal, still pulls hard, doesnt smoke...

thoughts? comments? suggestions?
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Old 04-30-2005, 10:15 PM
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Default Re: Weird AFR dips between shifts, ideas? OBD1/Crome

Sound like you need to work on your Throttle Tip-in when tuning.
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Old 05-01-2005, 03:53 AM
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Default Re: Weird AFR dips between shifts, ideas? OBD1/Crome

Originally Posted by xenocron
Sound like you need to work on your Throttle Tip-in when tuning.
sounds like spanish. i was watching it more tonite and it looks like it actually dips to 10.9:1, then as the rpms climb, the AFR's do too, a tenth of a point at a time, so maybe i just need to lean some ---- out. seems to be 4000-5000 rpm range, ill post the datalog in a few when i get on the laptop.

here it is
the datalog is attached, change the file extension from txt to zto and open in zeitronix datalogger software.
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Old 05-01-2005, 06:32 AM
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Default Re: Weird AFR dips between shifts, ideas? OBD1/Crome

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Old 05-01-2005, 03:50 PM
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Default Re: Weird AFR dips between shifts, ideas? OBD1/Crome

sounds like you need to adjust tip in.
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Old 05-01-2005, 11:23 PM
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Default Re: Weird AFR dips between shifts, ideas? OBD1/Crome

Originally Posted by sohc_mshue
sounds like you need to adjust tip in.
still sounds like spanish, guess i need to figure out what that is, and how to mess with it.

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Old 05-02-2005, 10:08 AM
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Default Re: Weird AFR dips between shifts, ideas? OBD1/Crome

what's your 'fuel modifiers' (if using uber), 'individual fuel multipliers' (if using crome) set at?
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Old 05-02-2005, 07:01 PM
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Default Re: Weird AFR dips between shifts, ideas? OBD1/Crome

Originally Posted by projekteg
what's your 'fuel modifiers' (if using uber), 'individual fuel multipliers' (if using crome) set at?
this is with crome, im looking for those settings, not sure where I'm supposed to be looking, but I guess if I look long enough I'l find it right?
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Old 05-02-2005, 08:57 PM
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Default Re: Weird AFR dips between shifts, ideas? OBD1/Crome

fuel tools (calculator icon in toolbar) -> advanced
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Old 05-02-2005, 09:51 PM
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Default Re: Weird AFR dips between shifts, ideas? OBD1/Crome

Originally Posted by projekteg
fuel tools (calculator icon in toolbar) -> advanced
there are for fields, main fuel, o2 correction, startup, tip in, all set to 1.000

really odd, i was looking at those earlier and they were greyed so i couldnt change them, opened it again to look at the names on the 4 fields, and they're no longer greyed, very odd. sadly im not gonna be able to do much about this now for a while cause i cant datalog, my laptop is buggin out on me again, i think it possibly fried memory again. poop.

TurboEF9 was talking to me in the beachhouse, doesnt seem to think its a tip-in issue.
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