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06-26-2013
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#1 |
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Join Date: Jul 2009
Location: Texas
Posts: 790
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strange surge
When coasting fron 30mph to around 5mph in neutral either with clutch in or out the engine surges until you slow to around 5mph and then it smooths out. Now i just replaced all the injectors with new delphis, rebuild the entire secondary vacum system, replaced the map sensor and anything else I could think of under the plenum. Now the car did this before I did all the work but it was more prone to dieing when it was surging and the surging was more erratic then. Dose anyone have any idea what it might be.
Here is the video of the surge https://www.facebook.com/photo.php?v...42547347021421 And here are the pictures of all the work I have done so far https://www.facebook.com/media/set/?...1&l=bf12a0aa41 Dave Last edited by mgbrv8; 06-26-2013 at 11:20 PM. |
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06-26-2013
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#2 |
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Join Date: Jul 2009
Location: Texas
Posts: 790
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Re: strange surge
I was thinking new O2 sensors maybe??
Dave |
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06-26-2013
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#3 |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,161
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Re: strange surge
What PROM (MEMCAL) is in the the car?
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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06-27-2013
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#4 |
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Join Date: Jul 2009
Location: Texas
Posts: 790
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Re: strange surge
What ever came from the factory.
Dave |
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06-27-2013
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#5 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,161
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Re: strange surge
I think it was an issue in the OEM memcal and there was an updated MEMCAL to fix that specific issue
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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06-27-2013
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#6 |
Join Date: Apr 2006
Location: Ideho
Posts: 2,647
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Re: strange surge
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?? |
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06-27-2013
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#7 |
 
Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,193
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Re: strange surge
Surges? Try simple stuff first.
Clean the IAC and the pathway into and out of it on the TB.
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Scott  Vett owner since 1979._It's about the car and the people |
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06-27-2013
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#8 | |
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Join Date: Jul 2009
Location: Texas
Posts: 790
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Re: strange surge
I dissasembled and cleaned the throttle body completely and the IAC. now I did order a new IAC and o2s it's on it's way we will see what that dose. Oh one thing this car has headers and O2 extensions
Dave Quote:
Last edited by mgbrv8; 06-27-2013 at 01:44 AM. |
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06-27-2013
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#9 | |
  
Join Date: Aug 2005
Location: Northridge, CA
Posts: 1,456
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Re: strange surge
Quote:
from the throttle body butterfly shafts. This is supposed to be there (Dap?) as a vacuum seal, else a leak. |
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06-27-2013
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#10 | |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,161
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Re: strange surge
Quote:
thanks I could not remember what issue the chip fixed.. that is why I stated I Think.. since I was not sure
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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Linear Mode
