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09-06-2020
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#1 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Car running rough and Stalling
Thoughts on the data below I am thinking a map or TPS issue? Idles ok and then falls apart and almost stalls when you accelerate Image1599440706.215497.jpgImage1599440726.696596.jpg
Sent from my iPhone using ZR-1 Net Registry
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 09-20-2020 at 10:42 AM. |
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09-06-2020
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#2 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,154
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Re: Car running rough and Stalling
Hmm, bad MAP should throw a code.. TPS with key on engine not running you should be able to exercise the TPS and see the voltage.
How old is the gas?
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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09-06-2020
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#3 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Re: Car running rough and Stalling
I commented on FB that the MAT sensor reading was low unless it was relocated.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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09-06-2020
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#4 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Car running rough and Stalling
-New Gas
-New fuel Pumps -New Filter -Pumps and pressure test good -Spark seems strong it will arc when pulled -idle is fine -Once under load it almost dies -when you let off and give it a second it recovers and you can drive slowly
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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09-07-2020
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#5 |
 
Join Date: Aug 2012
Location: Ellicott City, MD
Posts: 1,671
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Re: Car running rough and Stalling
Sounds like my problem a few days after I installed new fuel pumps. One of the hose clamps came loose and under load would pull away from the assembly and starve the engine of fuel. Replaced with stainless clamps and problem solved.
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Charlie __________ Dredgeguy WAZOO Member 1992 Bright Red/Black ZR1 #246 Dana 4:10 gears Polished LT5 by Haibeck Polished Fikse FM5's with Michelin Pilot Sport 2 Stainless Works headers and cats with Corsa |
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09-07-2020
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#6 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Car running rough and Stalling
Im not seeing drops in Fuel Pressure but will put this on my list, thanks
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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09-07-2020
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#7 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Re: Car running rough and Stalling
Quote:
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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09-07-2020
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#8 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Car running rough and Stalling
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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09-07-2020
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#9 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Car running rough and Stalling
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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09-07-2020
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#10 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Car running rough and Stalling
-New MAP sensor and hardline hose; little to no change
-Seems like its maybe not getting enough fuel or timing
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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Linear Mode
