|
01-31-2021
|
#1 |
 Join Date: Nov 2014
Location: Brooklyn ny
Posts: 1,045
|
Hesitant on acceleration and nothing when you mash the throttle
Car will run at relatively low speeds if you feather the gas.....Once you mash the throttle it falls on its face...Idle is fine..No check engine light ....
91 Z w 510 package w cams ..Sec deleted..Pumps were swapped 5,000 miles ago...Fuel filter about 15,000 miles ago..Car has 57,000 miles.. Bad gas ? Don't think that's it....Cars driven regularly ....Put some fresh gas yesterday...Same thing....No backfire just hesitant and nothing when you lean into the throttle... Anyone ? |
|
|
|
01-31-2021
|
#2 |
Join Date: Jan 2009
Location: New jersey
Posts: 156
|
Re: Hesitant on acceleration and nothing when you mash the throttle
any info prior to the problem? when did it run well last?
was it an all of a sudden thing or a gradual decline in power loss? any changes done or maintenance done recently? Sounds like a secondary fuel pump from the limited info at this time, need to check fuel pressure and report back I have a feeling this is gonna be a good one...... John |
|
|
|
|
01-31-2021
|
#3 |
 
Join Date: Aug 2012
Location: Ellicott City, MD
Posts: 1,634
|
Re: Hesitant on acceleration and nothing when you mash the throttle
Check the fuel line connections to the fuel pumps. I had similar conditions but worse and it would stall. A loose fuel line was the problem. Put a stainless steel clamp on and problem solved. Think if you pull the fuel pumps you will see possible crack in the Y or a loose hose connection. Good luck and keep us posted.
__________________
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 |
|
|
|
|
01-31-2021
|
#4 |
|
Join Date: Nov 2014
Location: Brooklyn ny
Posts: 1,045
|
Re: Hesitant on acceleration and nothing when you mash the throttle
Ok...Had car out about a week ago before yesterday...No prior problems at all....A little over a year ago I had a hose disconnect from one of the pumps......Car would not even start...Notice though yesterday that car started a little funny....Had to crank it a few times even when it was warmed up....I guess I can take out pumps and have a look.....
|
|
|
|
|
01-31-2021
|
#5 |
Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,105
|
Re: Hesitant on acceleration and nothing when you mash the throttle
Why not check your fuel pressure with a gauge???
__________________
Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454 |
|
|
|
|
01-31-2021
|
#6 | |
 
Join Date: Sep 2008
Location: Mullica Hill, New Jersey
Posts: 2,566
|
Re: Hesitant on acceleration and nothing when you mash the throttle
Quote:
You need to confirm adequate pressure. It sure sounds like no fuel upon secondary demand. Tape the gauge to the windshield and see what is going on. Also, with recent cold snap any water in fuel tank, lines or filter becomes more of a problem. The cold also lengthens the time until operating temperature is reached. While your secondarys are mechanically full time, if your ECM sees temp below operating temp I wonder what it has been told to do if re-tuned, or is it running original tune. Normally, it would not want to pulse those secondary injectors. Does the problem occur below and above 180 degrees?  Marty |
|
|
|
|
|
01-31-2021
|
#7 | |
|
Join Date: Nov 2014
Location: Brooklyn ny
Posts: 1,045
|
Re: Hesitant on acceleration and nothing when you mash the throttle
Quote:
Yes car has been retuned by Dempsey when I got the work done ....Storm is expected to hit tonight so not sure when I can bring it somewhere to check fuel pressure....Maybe my mechanic friend of mine has one that I can use... I'm in on that 04...Let me know what's up... |
|
|
|
|
|
01-31-2021
|
#8 |
|
Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,105
|
Re: Hesitant on acceleration and nothing when you mash the throttle
Are you running original air intake? Could it be collapsing? I still vote on fuel pressure. You can rent them for free at most parts stores. (you would need an extension to tape it to windshield)
__________________
Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454 |
|
|
|
|
01-31-2021
|
#9 | |
|
Join Date: Nov 2014
Location: Brooklyn ny
Posts: 1,045
|
Re: Hesitant on acceleration and nothing when you mash the throttle
Quote:
As far as driving it taped to windshield we are expecting 15 inches of snow in NY.... ( Great ). Air intake is original but in excellent condition... |
|
|
|
|
|
01-31-2021
|
#10 |
|
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,667
|
Re: Hesitant on acceleration and nothing when you mash the throttle
Is this something new or has it been like this since mod?
__________________
[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 |
|
|
|
 |
|
|
Linear Mode
