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1986 Corvette Motor misses sometimes

B

Bill

Guest
I put new plug wires on. Checked the plugs(they are good)
I put in injecter cleaner. That seemed to help.
It will miss from time to time. Never know when it will do it.
It is noticeable when you pull up to a stop sign. It isn't smooth.
The motor was rebuilt and has about 20,000 on re-build.
Any advise will help. I don't drive it that often, couple times a month.
Thanks
 

JT ZR-Won

Well-known member
Joined
Dec 6, 2000
Messages
1,273
Location
Bradenton, FL
Corvette
'90 ZR-1 #365 (SOLD...but Dad's got it now)
Have you replaced the fuel filter lately? Also, how are your plug wires? If they are old, the slightest crack in the wire will make the car run a little rough.
I would also check to see if all the the terminals on the cap & rotor are not corroded......

Jay
 
H

hoosierguy60

Guest
gas octane

i have an 86 also and it seems like if i use 87 octane the car misses out more i also agree plugs look good but can be brokedown internally, along with the cap , dont get the cheap aluminum point one , get the copper tipped one ...doesnt corrode as easy...good luck
 

vigman

Motor head!!!!
Joined
Feb 13, 2001
Messages
3,471
Location
Valencia, CA,USA
Corvette
88 Convert ( SOLD ) /1973 coupe 4 speed/1964 Vert!
Missing

Lets see if I've got this...
New wires, checked plugs ( what kind of plugs are you running) OLD Cap & rotor? No error codes ( Check engine light?) It looks like cleaning the IAC is next.

Buy a new throttle body gasket before starting!!!!
and probably a new hose from the intake mainfold to the throttle body.

Remove throttle body (2 water hoses,2 electrical connectors, throttle & cruise linkage, 2 vac lines).
remove IAC VALVE

Clean carefully the cavity in the throttle body.
Clean the back side of the throttle body.
Check for play ( wiggle ) of the throttle plates & shaft.. if it moves there a good chance your leaking air around the plates, this needs to be fixed.My local carb shop re-bushed mine for $125.00

Clean the pintle ( TIP ) of the IAC valve DO NOT LET ANY CARB CLEANER RUN DOWN THE SHAFT OF THE IAC.

Re assemble.
It would be a good idea at this point to check the TPS ( Throttle position sensor ) for .54 volts at idle ( key on, engine off, volt meter DC across pins A&B with TPS connected.)

Start car and Immediatly & shut it off then start again... this will relearn the IAC settings.


Mike
 

hoosier

Active member
Joined
Aug 17, 2001
Messages
35
Location
Millersville,Pa.USA
Corvette
86 Pace Car 31,000 miles
missing

Hey Mike would it also help to drain a little radiator fluid first , LOL

Barry
 

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