Bogging after Coasting

[Paul Workman]

Originally Posted by Dmod81

Paul,
Your issue does sound similar, but mine never stalls. It just hesitates bad as I tip in the throttle after decel. If I mash the throttle, it'll jolt back to normal, almost like a really bad shift. I'm now wondering if it in fact can be tuned out. I've got a military PCS coming in a few months, and I'll need to get this fixed before then. Since I'm in CA now, I'm looking at a mid (CO) to cross-country (VA) move.

Ummm.... I'm not sure it isn't the same thing. When I first noticed it, it would bog on throttle tip-in, and sputter and jerk a bit before catching and running normally again.

Now, having lived with it a while, I'm able to detect it before I have to get back on the "gas" and take steps to clear it before I actually experience the bog.

It's in the tune, I'm pretty sure. Fortunately, it doesn't occur every time or it would have risen to a much higher priority by now. Just a nagging little irritation is all. Nothing as bad as a beautiful girlfriend with a chipped front tooth might be!

[Scrrem]

Originally Posted by Paul Workman

Ummm.... I'm not sure it isn't the same thing. When I first noticed it, it would bog on throttle tip-in, and sputter and jerk a bit before catching and running normally again.

Now, having lived with it a while, I'm able to detect it before I have to get back on the "gas" and take steps to clear it before I actually experience the bog.

It's in the tune, I'm pretty sure. Fortunately, it doesn't occur every time or it would have risen to a much higher priority by now. Just a nagging little irritation is all. Nothing as bad as a beautiful girlfriend with a chipped front tooth might be!

Paul,
Did Marc H. do your chip by chance?
Rich

[Dmod81]

Originally Posted by Paul Workman

Ummm.... I'm not sure it isn't the same thing. When I first noticed it, it would bog on throttle tip-in, and sputter and jerk a bit before catching and running normally again.

Now, having lived with it a while, I'm able to detect it before I have to get back on the "gas" and take steps to clear it before I actually experience the bog.

It's in the tune, I'm pretty sure. Fortunately, it doesn't occur every time or it would have risen to a much higher priority by now. Just a nagging little irritation is all. Nothing as bad as a beautiful girlfriend with a chipped front tooth might be!

Ok, yep, it is the same. Mine seems to do it every time I get back on the gas though. What injectors do you have?

[XfireZ51]

Originally Posted by Dmod81

Ok, yep, it is the same. Mine seems to do it every time I get back on the gas though. What injectors do you have?

It's not injectors. You're taking in more air. Need to adjust fuel as 1 parameter.

[Dmod81]

Originally Posted by XfireZ51

It's not injectors. You're taking in more air. Need to adjust fuel as 1 parameter.

Oh ok. That's good. Is this something that can be tuned out long distance?

[XfireZ51]

Originally Posted by Dmod81

Oh ok. That's good. Is this something that can be tuned out long distance?

Not a fan of long distance tuning. First of all, I would want to make sure that everything is mechanically correct. Things like Min Air, TPS v, . Would want to do a scan just to see that everything tests out. How far is mike100 from u in CA?
I have a 92, so I have a number of calibrations I did for it at a similar level of mod.

BTW, I notice u are using 2piece rotors w Z06 brakes. I am just now upgrading from the stock Z06 rotors to 2 piece Paerformance/AFX rotors. Any thoughts or impressions?

[Dmod81]

Looks like he's about 4 hrs 15 mins away. Kind of far. I could do a tunerpro log.

I never had stock Z06 rotors on the car, so I can't compare to those. They're pretty light ( lighter than stock ZR-1 rotors I think) and stop the car well. No fading so far at all and they seem to be wearing really well. With hawk HPS pads I get a slight squeal very infrequently. I painted mine off of the sweep area so I don't get any rust and even that has held up well. In short, definitely worth it.

Oh, and one issue I had was that the bolts on the rears rubbed the outer rim of the street shop adapter. A bit of time with the file took care of that.

[XfireZ51]

Originally Posted by Dmod81

Looks like he's about 4 hrs 15 mins away. Kind of far. I could do a tunerpro log.

I never had stock Z06 rotors on the car, so I can't compare to those. They're pretty light ( lighter than stock ZR-1 rotors I think) and stop the car well. No fading so far at all and they seem to be wearing really well. With hawk HPS pads I get a slight squeal very infrequently. I painted mine off of the sweep area so I don't get any rust and even that has held up well. In short, definitely worth it.

Oh, and one issue I had was that the bolts on the rears rubbed the outer rim of the street shop adapter. A bit of time with the file took care of that.

If you could do a TP log and send me a csv file, that could help. Do a log w just key ON to get the nominal sensor values, then a log of a situation where the motor shuts down. Do a decel, then tip in of accelerator.

[Dmod81]

Sure, I can do that sometime in the next few days. Thanks.

[WARP TEN]

Originally Posted by Paul Workman

Ummm.... I'm not sure it isn't the same thing. When I first noticed it, it would bog on throttle tip-in, and sputter and jerk a bit before catching and running normally again.

Now, having lived with it a while, I'm able to detect it before I have to get back on the "gas" and take steps to clear it before I actually experience the bog.

It's in the tune, I'm pretty sure. Fortunately, it doesn't occur every time or it would have risen to a much higher priority by now. Just a nagging little irritation is all. Nothing as bad as a beautiful girlfriend with a chipped front tooth might be!

I have a similar setup as Paul with the Haibeck 350/510 HP package. I have never experienced regular stalling or stumbling but once in a while I get a little stumble on take off, almost as if the engine were getting a little flooded. It only happened when I have been say, coming out of a parking lot in which I have the old timer's habit of blipping the throttle (as if one needed to clear the plugs on a 68 Hemi Roadrunner). I think it was confusing the computer. It always cleared up immediately, maybe in 100 feet of driving. Marc suggested that behavior like that is often related to O2 sensors that are not 100%. He reminded me that he had not changed them when he did the work so they are 20 years old, although with only 30k miles on them. I have obtained some new ones but haven't yet installed them, and actually have not experienced the problem during much of the past year. Probably will put them in this spring just in case.--Bob