Vapor Lock ?
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Intermediate
Joined: May 2003
Posts: 41
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From: gurnee Illinois
Vapor Lock ?
Here is my problem. I have a 99 vette with 47000 on it the only mods I have is a Corsa exhaust and a Blackwing filter. I have no x-pipe. I drive 30 miles to work and then 30 miles back. In the morning the car runs great. When I go home I hit about 15 minutes of bumper to bumper traffic but still no problems. The car does not run hot. I then park in my garage when I get home. After about an hour or so if I take the car back out, the car will hesitate, stall and even die out. I do not get a check engine light and no codes. I check the fuel pressure and still shows about 58 lbs when the car is acting up. The engine compartment is still very hot. It appears to be some sort of vapor lock, the car only does this after it sits when I come home from work after about 45 minor an hour. I even wiggle the fuel line coming off of the fire wall, its hot. and the car will hesitate. I have no idea what the problem is. When the car cools off completely I have no problem. :confused: Thanks for taking the time to read this. Has anyone ever had this type of problem. Thanks Nick
Safety Car
Joined: Jun 2003
Posts: 4,640
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From: Sunshine State
Re: Vapor Lock ? (Nixs99)
I've not had this problem but you have to eliminate potential causes one step at a time. Try parking out side with the hood up when you get home and go from there. The fans may be shutting off too early causing a vapor lock. Through the process of elimination you'll find the problem.
Bob
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Bob
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Heel & Toe
Joined: Aug 2003
Posts: 17
Likes: 0
From: Sarnia Ontario
Re: Vapor Lock ? (Nixs99)
Had almost EXACTLY this trouble with an old Toyota Tercel. Turned out it was the Engine Coolant Temp Sensor, the one that tells the PCM how to fuel the engine. Sensor bad, bad fueling, stall, run bad. It was so bad that I could almost predict where on my route home from work it would act up. Might be worth a look.
Drifting
Joined: May 2002
Posts: 1,607
Likes: 1
From: San Francisco CA
Re: Vapor Lock ? (JonV)
Had almost EXACTLY this trouble with an old Toyota Tercel. Turned out it was the Engine Coolant Temp Sensor, the one that tells the PCM how to fuel the engine. Sensor bad, bad fueling, stall, run bad. It was so bad that I could almost predict where on my route home from work it would act up. Might be worth a look.
Safety Car
Joined: Sep 2001
Posts: 4,411
Likes: 1
From: Wilmington NC
Re: Vapor Lock ? (Nixs99)
Here is my problem. I have a 99 vette with 47000 on it the only mods I have is a Corsa exhaust and a Blackwing filter. I have no x-pipe. I drive 30 miles to work and then 30 miles back. In the morning the car runs great. When I go home I hit about 15 minutes of bumper to bumper traffic but still no problems. The car does not run hot. I then park in my garage when I get home. After about an hour or so if I take the car back out, the car will hesitate, stall and even die out. I do not get a check engine light and no codes. I check the fuel pressure and still shows about 58 lbs when the car is acting up. The engine compartment is still very hot. It appears to be some sort of vapor lock, the car only does this after it sits when I come home from work after about 45 minor an hour. I even wiggle the fuel line coming off of the fire wall, its hot. and the car will hesitate. I have no idea what the problem is. When the car cools off completely I have no problem. :confused: Thanks for taking the time to read this. Has anyone ever had this type of problem. Thanks Nick
I could be wrong but AFAIK vapor lock is almost impossible with the fuel delivery pressures of today's engines. Also I don't know where the vapor lock could even occur. My guess is that a sensor is giving the PCM some wrong information.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Re: Vapor Lock ? (Nixs99)
NIXS99
I doubt if your high pressure fuel system is vapor locking. The high pressure keep the fuel from boiling off when the fuel line gets hot. You may have a secondary ignition problem. See if you have spark at the spark plugs when you expierence the problem. If you do not see any codes, you could have an ignition coil power problem.
Bill C
I doubt if your high pressure fuel system is vapor locking. The high pressure keep the fuel from boiling off when the fuel line gets hot. You may have a secondary ignition problem. See if you have spark at the spark plugs when you expierence the problem. If you do not see any codes, you could have an ignition coil power problem.
Bill C
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