Strange Hesitation please help!!!!
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
If you tore everything down to get to opti just replace it-no sense in just replacing the cap & rotor when your there.The opti is also your cam sensor as well.Also there should be NO arcing out of wires & if new wires are arcing they are defective/bad.Fill an empty spray bottle full of water & mist spark plug wires checking for "leaking" spark.Get quality wires not cheapes.First fix arcing wire problem before doing anything else
This is definitely a good starting place with the routine stuff. I would as said check the fuel pressure and FRP as well. I would also take a look at the TPS (throttle position sensor) and check the voltage off the center wiper for a smooth transition from 0 to 5 volts.After all that then I would probably zero in on the opti as you do have some classic signs of it being defective.
I would put the injectors last on my list as those year cars have injectors that hold up very well unlike the earlier vetts of the 80s.
Thread Starter
Burning Brakes
Joined: May 2009
Posts: 787
Likes: 1
From: Hialeah Florida
I just wanted to comment that here in florida we had a cold front for about a week. within that week ive head minimum hesitation as the car has stayed at about 175 degrees. Even though i can feel something is not right the hard hesitation is gone. Our cold front is gone now and the car performs the same until about 200 degrees it then progressively hesitates worse and worse as the temps rise. It hesitates on light, moderate and wot. As I stated before im gathering up parts to change for next weekend. Ive bought new bosch spark plug wires, bosch platinum plus spark plugs, purolator fuel filter, BVD ignition coil an i ordered a new gm water pump and a new msd opti. Anything else you guys want to suggest? Ill be running a diagnostic this week to see if I have any codes. The car has 150,000 miles and ive only had it a year and its unknown to me what has been replaced. So all this to me is routine I think stuff that should be replaced anyway. By the way my carruns rich what could be the reasons for that? my car is stock except for the exhaust and an open airlid.
Thread Starter
Burning Brakes
Joined: May 2009
Posts: 787
Likes: 1
From: Hialeah Florida
im not sure thats why ive been posting here. Most cases its the opti. Ijust so happened to have wet mine and it started hesitating a week later. But like mosta people have posted it could be many different things thats why im changing more than just the opti.
Instructor
Joined: Jul 2004
Posts: 210
Likes: 0
From: Lakewood CO
I've got a similar hesitation problem that developed a few weeks ago. I have tested all the components listes in this thread, plugs, wires, ICM, coil, TPS, etc and believe my problem is with the opti. I'm tearing down the car to do the opti and waterpump this week and will let you know how it turns out.
Dave
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Thread Starter
Burning Brakes
Joined: May 2009
Posts: 787
Likes: 1
From: Hialeah Florida
I've got a similar hesitation problem that developed a few weeks ago. I have tested all the components listes in this thread, plugs, wires, ICM, coil, TPS, etc and believe my problem is with the opti. I'm tearing down the car to do the opti and waterpump this week and will let you know how it turns out.
Dave
Dave
thanks
Your not serious?
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
Melting Slicks
Joined: Oct 2005
Posts: 3,178
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From: Daleville Indiana
St. Jude Donor '08
Burning Brakes
Joined: Oct 2009
Posts: 773
Likes: 2
From: Minneapolis MN
Glad to help
Thread Starter
Burning Brakes
Joined: May 2009
Posts: 787
Likes: 1
From: Hialeah Florida
Well i bought the new opti from a forum member about a week ago. Im going to be doing the job soon ill let you know. Im sure mine got wet because it started doing it after I cleaned the engine. My car hesitates the most at low rpms at high load and when the car is over 200 degrees.
