Bogs for a second and then takes off

[XfireZ51]

Originally Posted by Johnny5

"It appears that Z owners that is having the problem have in commons are: 1) the secondaries eliminated
2) Haibeck chip

How about the injectors. What injectors do you have currently installed. I have talked to Marc in regards to this concern and he has 2 1990 that are doing the same thing as well. He suspecting injectors. I'm going to data log and check the car out this weekend. Will let you know what I find out. We can make some changes to the fuel trim if need be."

I have a 1991 (27k miles) that is all stock so I did not delete the secondaries or have a chip. (The secondaries won't open up either) it currently has the stock injectors as well and I noticed my car bogs or surges when cold too! I'll see if it does this after changing the injectors. I just ordered the obd2 to obd1 conversion so i can see if I get any codes from my scanner.

I have secondaries removed for many years using my own calibration.
I don't have any bog. Just sayin.

[Paul Workman]

Originally Posted by Johnny5

"It appears that Z owners that is having the problem have in commons are: 1) the secondaries eliminated
2) Haibeck chip

Apples n oranges... At issue is bogging upon acceleration. The occasional stalling on de-cel has a different set of circumstances and characteristics; perhaps coincidental to secondary delete and Marc's calibration. But, it is certainly NOT a new phenomenon, and NOT exclusive to the LT5 at all.

And, with regard to deleting the secondaries, in many cases, it is often in conjunction with some amount of porting; porting which alters the AF requirements a bit which may well "poke the bear" a bit.

So, IMO it would be a mistake at this time to make attempt to codify a connection between the secondary port throttle (SPT) elimination OR Marc' calibrations exclusively (others do both as well). Juuuust sayin.