ZR-1 Net Registry Forums - Had a quick question about choking on deceleration.

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- - Had a quick question about choking on deceleration. (http://zr1.net/forum/showthread.php?t=19939)

XfireZ51

04-11-2013 09:59 AM

Re: Had a quick question about choking on deceleration.

Tom,

That's the reason I asked about mods. DFCO is usually disabled in re-done cals because of stalling on modded motors.

GOLDCYLON

04-11-2013 10:39 AM

Re: Had a quick question about choking on deceleration.

Quote:

Originally Posted by XfireZ51 (Post 169363)

Tom,

That's the reason I asked about mods. DFCO is usually disabled in re-done cals because of stalling on modded motors.

AMEN

secondchance

04-11-2013 10:48 AM

Re: Had a quick question about choking on deceleration.

Quote:

Originally Posted by oricale (Post 169304)

I think I fixed the smoking issue(for the most part and did a few other things for this season)..BUT

I have always had this issue:....Upon releasing the gas pedel and allowing the car to slow itself by the gear with no brake on..and after a bit of deceleration at high rpm's its starts to choke on itself and sputter..all this goes away with a minimal amount of gas pedal.

Any ideas??

Dempsey,

Check your MAP hose. If it's a soft rubber hose replace with rubber fitting/hard plastic (whether OEM or fabricated).

Hog	04-11-2013 03:49 PM

Re: Had a quick question about choking on deceleration.

Sounds like DFCO to me, esp with a touch of throttle correcting the "issue".

peace
Hog

XfireZ51

04-11-2013 04:03 PM

Re: Had a quick question about choking on deceleration.

Quote:

Originally Posted by Hog (Post 169400)

Sounds like DFCO to me, esp with a touch of throttle correcting the "issue".

peace
Hog

The stock calibration calls for enabling DFCO at 1500rpm and disabling at 950. So your idle is set right at about the point the ECM is looking to exit
DFCO. Does it feel like its oscillating? Moving the TPS to 1.95% open takes it out of DFCO. Does that sound like what's happening to you?

tomtom72

04-12-2013 04:51 AM

Re: Had a quick question about choking on deceleration.

Quote:

Originally Posted by XfireZ51 (Post 169363)

Tom,

That's the reason I asked about mods. DFCO is usually disabled in re-done cals because of stalling on modded motors.

Thank you Dom! I just learned something new. :handshak: I had no idea about DFCO and modded motors.

I wonder is DFCO related to the backfiring under compression braking that seems to crop up on LT5's with headers?

:cheers:
Tom

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