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Old 09-27-2018   #1
Vette73
 
Join Date: Nov 2014
Location: Brooklyn ny
Posts: 1,045
Default Hesitation than cleared itself

Like the title says hesitate than clear..

Have not driven my Z since Carlisle..Took it out this morning....Car ran fine for first five -six minutes.....Upon acceleration it began to hesitate than it would clear itself.....Did it about five or six times....Had car out for about 25 minutes...

Idle would also drop at times when I was stopped....Car is ported and cammed 91...

Accel injectors..Swapped out fuel filter about 7,000 miles ago....

Thought maybe its bad gas but I filled up the w end of carlisle....Car runs great up until this morning...

Thoughts?
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Old 09-27-2018   #2
QB93Z
 
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Join Date: May 2007
Location: Westminster, Maryland
Posts: 3,689
Default Re: Hesitation than cleared itself

Are you referring to hard acceleration (secondaries opening) or just mild acceleration in traffic?

Do you have access to a Tech 1 or similar scanner?


Jim
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Old 09-27-2018   #3
Vette73
 
Join Date: Nov 2014
Location: Brooklyn ny
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Default Re: Hesitation than cleared itself

Hey Jim..

Secondaries deleted..I would say normal acceleration....Roughness at idle at times as well...
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Old 09-27-2018   #4
jss06c6
 
Join Date: Aug 2015
Location: Magnolia, Texas
Posts: 884
Default Re: Hesitation than cleared itself

Definitely sounds like a fueling issue. Did it stop after it was completely warmed up? Can you check fuel pressure upon acceleration? Are you still running with the original fuel pumps?

How long since Carlisle (I should know this)?

Steve

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Old 09-27-2018   #5
Vette73
 
Join Date: Nov 2014
Location: Brooklyn ny
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Default Re: Hesitation than cleared itself

Hey Jim...

It performed the way its supposed to when it got fully warmed up....That's my next step, check the fuel pressure..Don't know if they are original fuel pumps...

Will take it to my mechanic maybe Saturday morning....Before this morning, last time I used car was the Sunday of carlisle weekend..
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Old 09-27-2018   #6
jss06c6
 
Join Date: Aug 2015
Location: Magnolia, Texas
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Default Re: Hesitation than cleared itself

Quote:
Originally Posted by Vette73 View Post
Hey Jim...

It performed the way its supposed to when it got fully warmed up....That's my next step, check the fuel pressure..Don't know if they are original fuel pumps...

Will take it to my mechanic maybe Saturday morning....Before this morning, last time I used car was the Sunday of carlisle weekend..
Hmm, you might also pull your plugs and check them over.. pictures of them would be good as well..

Steve

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Old 09-27-2018   #7
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
Default Re: Hesitation than cleared itself

Quote:
Originally Posted by Vette73 View Post
Hey Jim...

It performed the way its supposed to when it got fully warmed up....That's my next step, check the fuel pressure..Don't know if they are original fuel pumps...

Will take it to my mechanic maybe Saturday morning....Before this morning, last time I used car was the Sunday of carlisle weekend..
Are you saying the issue was with “the warmup routine” as opposed to normal operation?
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Old 09-27-2018   #8
Vette73
 
Join Date: Nov 2014
Location: Brooklyn ny
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Default Re: Hesitation than cleared itself

Even if its not fully warmed up it should not have done this.....The last few mins of my drive it seemed to have gone away until I was backing into my garage I felt the idle start getting rough again...

Will see if my mechanic is in a " good mood " Saturday morning.....Will check for fueling issue..
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Old 09-27-2018   #9
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
Default Re: Hesitation than cleared itself

Quote:
Originally Posted by Vette73 View Post
Even if its not fully warmed up it should not have done this.....The last few mins of my drive it seemed to have gone away until I was backing into my garage I felt the idle start getting rough again...

Will see if my mechanic is in a " good mood " Saturday morning.....Will check for fueling issue..
Trying to understand what conditions were different today from Carlisle, ie temperature, weather?
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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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Old 09-27-2018   #10
Vette73
 
Join Date: Nov 2014
Location: Brooklyn ny
Posts: 1,045
Default Re: Hesitation than cleared itself

Well it was cooler today.than Carlisle at least 25 degrees...Great driving weather though..Good air no humidity..
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