strange surge

[mgbrv8]

I did clean the throttle body Thoroughly but the thing that bothers me is that it did this before I did anything in fact it was worst.

Dave

[XfireZ51]

Did you remove TB when you cleaned it? If you have a scantool, check the TPS v
with Ignition ON. Surging of the LT-5 is common when idling down in neutral and slowing down. This can be mitigated by flattening the Spark and VE tables in the
"Idling zone". I also change the IAC setting so the idle stays a bit high until it reaches Idle MPH. First thing is to determine there are no technical issues. I would look at the IAC counts at idle. Maybe MIN AIR needs adjusting.

[Dynomite]

Originally Posted by Hammer

It's not the chip. The engine would idle high for a bit and then settle down to normal, not surge like your's is doing. The later chip fixed that and Haibeck's chip does too. Call Corey or Marc and run it by them unless someone else has a fix, I don't.

TPS maybe??

Exactly as my 90' functions...I kind of liked that as it would idle high for a bit (about 5 - 10 seconds) right after starting and then settle right down to 750 more or less. Same when letting off throttle in neutral. It would take a few seconds to settle down to normal idle

But Marc sent me a new 90' chip so I expect now a normal and immediate idle under all conditions

[mgbrv8]

Yes I did.

Dave

Originally Posted by XfireZ51

Did you remove TB when you cleaned it? If you have a scantool, check the TPS v
with Ignition ON. Surging of the LT-5 is common when idling down in neutral and slowing down. This can be mitigated by flattening the Spark and VE tables in the
"Idling zone". I also change the IAC setting so the idle stays a bit high until it reaches Idle MPH. First thing is to determine there are no technical issues. I would look at the IAC counts at idle. Maybe MIN AIR needs adjusting.