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| 1987c4red | slight hesitation at 61mph and above is speed is held steady | ||
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Guru Newb
 
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When speed is held steady at or above 61 mph I get a slight hesitation. If I accelerate it doesnt happen.
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Posted on: 2007/11/13 21:57
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| CSS996 | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Mega Guru
 
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Welcome to the forum!
 Hopefully somebody can chime in with the answer here shortly. How old are the plugs and wires? Injectors? |
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Posted on: 2007/11/13 22:16
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Currently "Between Vettes". 
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| bogus | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Grand Imperial Pooh-Bah
 
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Welcome aboard! We will need more info... for us to help you, you need to help us.
mileage? overall maintenance history? |
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Posted on: 2007/11/14 5:11
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| JrRifleCoach | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Elite Guru
 
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Seems like a slight vacuum leak might be the problem.
Using a short piece of tubing or garden hose, listen for leaks while the engine is idling. Also try checking the intake tubes and plenum bolts for tightness. Good luck |
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Posted on: 2007/11/14 8:33
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| toptechx6 | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Senior Guru
 
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Sounds like you may be describing lock up cycling of the torque converter or an engine miss, but as others indicate your description isn't very clear.
The term hesitation normally describes lack of response to throttle movement on acceleration which confuses the issue for me. |
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Posted on: 2007/11/14 9:05
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| 1987c4red | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Guru Newb
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Thanks for the responses and I will try to give more information. New plugs, wires, cap and rotor. 55K miles. injectors are orginal. Car sat in a garage for last nine years with only approx. 9500 miles driven. Added a bottle of injector cleaner. intend to add another next fill-up.
It was suggested that I check for vacuum leak. where specifically? hesitation happens at 61 and speeds above held steady. Can also experience issue when car is stopped and in nuetral reving engine to high rpm and again held steady. |
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Posted on: 2007/11/14 13:43
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| CasetheCorvetteman | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Elite Guru
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Sounds like a miss-fire to me, after sitting 9 years there could be alot of things to cause that.
Clean the MAF sensor, check the coil, check the oxygen sensor, check the EGR function to be sure its fully closed when it should be, replace the fuel filter, change the oil and filter, fill the tank with good quality fuel, take it to the race track and flog the tits off it for about 150-200 miles. That should clear its throat. |
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Posted on: 2007/11/14 13:56
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| toptechx6 | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Senior Guru
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Quote:
Sounds like a miss-fire to me, after sitting 9 years there could be alot of things to cause that. Easy mate, flogging their bloody tits off will get you arrested for domestic violence on this side of the big pond!  |
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Posted on: 2007/11/14 14:36
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| daddue11 | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Senior Guru
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Quote:
Quote: That only applies to the Fleshy Kind. The fiberglass version is fair game.  |
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Posted on: 2007/11/14 16:29
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Aint no amount of gold in any ole mine,that would be enough to take away this car of mine.-beach boys |
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| CasetheCorvetteman | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Elite Guru
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Quote:
Easy mate, flogging their bloody tits off will get you arrested for domestic violence on this side of the big pond!  |
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Posted on: 2007/11/14 16:35
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| 1987c4red | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Guru Newb
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let me ask a newbie questions. How do you clean a MAF sensor?
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Posted on: 2007/11/19 14:49
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| 1987c4red | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Guru Newb
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Quote:
Quote: Case, Being a newbie how do you Clean the MAF sensor? |
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Posted on: 2007/11/19 14:50
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| CasetheCorvetteman | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Elite Guru
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With great care, use some mineral turps or methylated spirits, and clean it with a very soft paint brush. Use extreme care not to damage the wire.
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Posted on: 2007/11/20 9:31
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| 1987c4red | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Guru Newb
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Case, thanks for the info. As you can tell I am not to knowlegable about fuel injection systems. I have building custom harley for years. Found 87 c4 in lady's garage She put less than 9K mile of it over 9 years. discovering whole new world of hot rods again.
PS Took your advise and "flogged the tits off" of it last weekend......boy have I got the fever! |
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Posted on: 2007/11/20 14:52
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| 1987c4red | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Guru Newb
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Quote:
Sounds like a miss-fire to me, after sitting 9 years there could be alot of things to cause that. Case, Can I use a typical aerosol cleaner typically use to clean trottle body for MAF? |
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Posted on: 2007/11/20 14:56
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| CasetheCorvetteman | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Elite Guru
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Yes mate you can use that, and that might even be a better option for it too, just use caution that the pressure isnt too high.
If this MAF still has screens on it, remove them.Did giving it a flogging help to clear it out abit? If not, ill bet you had fun doing it eh? We may have to discuss custom Harleys abit further at some time, i have alot of mates with Harleys over here.  |
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Posted on: 2007/11/21 3:31
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| 1987c4red | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Guru Newb
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Thanks Case,
Still have problem. Getting frustrating now. Somebody please give me the magic answer! |
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Posted on: 2007/11/21 13:21
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| bogus | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Grand Imperial Pooh-Bah
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I will have to refer to my 1987 Helm Manual...
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Posted on: 2007/11/21 15:30
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| 1987c4red | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Guru Newb
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Any luck on the Helm manual, I'm still trying to find the problem?
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Posted on: 2007/12/18 19:57
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| CasetheCorvetteman | RE:slight hesitation at 61mph and above is speed is held steady | ||
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Elite Guru
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Cant you find it in your GM service manual?
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Posted on: 2007/12/19 8:16
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