Weird issue with Drive to Reverse and Reverse to Drive...

[01Blackerado]

Anyone experience an issue where the motor will surge around 1200 RPM then drop sudenly to about 250RPM and sometimes die?!? This only happens when moving the gear selector to either reverse or drive, from either reverse or drive!! From park or neutral it gos into gear just fine. It basically surges high in between the gear grab. So when the trans has that brief moment where it kind of goes into nuetral to change to either the forward or reverse gear, it wil surge up... then drop massively once it actually catches the gear thats been selected. Also noticing that the engine will not idle at the desired idle speed while its in a gear period... about 100RPM or so under the speed. I used the Bidi controls to see if its a spark issue and i had to bring the advance to 40* in order to get the idle back up to where it used to be while in gear. Any ideas greatly appreciated...wondering if this is mechanical and not in the tune.

Thanks,
Nick

[redhardsupra]

tune your Running Airflow tables, you're probably not getting enough air at idle/near idle.

[01Blackerado]

Ok I'll check and see... I'm doing some general maintenance first before i tweak the tune just to make sure... Fuel filter (20K miles), Air Filter(Not cleaned in 10K miles), Spark plugs about 7K miles. If that doesnt fix it then Ill hop in those airflow tables. Thanks Sup

[joecar]

Some of these threads may help:



Idle Tuning
showthread.php?4661-Idle-Tuning-Helpful-Info-Inside (http://forum.efilive.com/showthread.php?4661-Idle-Tuning-Helpful-Info-Inside)
showthread.php?14439-Idle-Tips-amp-Tricks (http://forum.efilive.com/showthread.php?14439-Idle-Tips-amp-Tricks)
showthread.php?14153-scan-tool-wont-log-rafig-or-rafpn (http://forum.efilive.com/showthread.php?14153-scan-tool-wont-log-rafig-or-rafpn)
showthread.php?14435-Need-help-Can-Start-Car-but-dies-when-I-give-it-any-throttle-before-going-to-CL (http://forum.efilive.com/showthread.php?14435-Need-help-Can-Start-Car-but-dies-when-I-give-it-any-throttle-before-going-to-CL&p=129519&viewfull=1#post129519)
showthread.php?7011-ETC-cars-and-IAC-parameters (http://forum.efilive.com/showthread.php?7011-ETC-cars-and-IAC-parameters&p=61455&viewfull=1#post61455)
showthread.php?14544-Working-on-my-idle-tune (http://forum.efilive.com/showthread.php?14544-Working-on-my-idle-tune)
showthread.php?14794-Help-with-open-loop-%28cold-start%29-tuning (http://forum.efilive.com/showthread.php?14794-Help-with-open-loop-%28cold-start%29-tuning&p=133446#post133446)
showthread.php?149-Idle-%28Transition%29-Tuning (http://forum.efilive.com/showthread.php?149-Idle-%28Transition%29-Tuning)

More Idle Tuning
showthread.php?t=149 (http://forum.efilive.com/showthread.php?t=149)
showthread.php?t=5866 (http://forum.efilive.com/showthread.php?t=5866&highlight=RAFIG)
showthread.php?p=86553 (http://forum.efilive.com/showthread.php?p=86553) post #17
showthread.php?t=2630 (http://forum.efilive.com/showthread.php?t=2630)
showthread.php?t=473 (http://forum.efilive.com/showthread.php?t=473)

Throttle Cracker/Follower
showthread.php?t=3568 (http://forum.efilive.com/showthread.php?t=3568)
showthread.php?t=4081 (http://forum.efilive.com/showthread.php?t=4081)
showthread.php?t=5406 (http://forum.efilive.com/showthread.php?t=5406)
showthread.php?t=5940 (http://forum.efilive.com/showthread.php?t=5940)

[01Blackerado]

Thanks fellas for the responses... looks like general maintenance was what the culprit was... changed the plugs and cleaned the K&N everything is kosher

[joecar]

Cool :cheers: