NEED HELP/Hard Start
Thread Starter
Instructor
Joined: May 2003
Posts: 205
Likes: 0
From: floral park ny
NEED HELP/Hard Start
i have a ecs paxton setup w/ alky control meth setup and all the sudden im getting an issue when i start the car up after driving for a little or it sits for a while i start it and it idles extremely low almost dies for about 5 seconds then runs fine. almost feels like when you hit the test button on meth and car almost dies. i previously checked the meth to see if its leaking while sitting but it doesnt appear to be that, also wrapped meth hoses as per julio , just in case of heat soak. any suggestions are greatly appreciated thanks
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
Here's what I think is happening, there's a 2-3# check valve in the pump and you have a 1# check valve in the line at the nozzle.
The meth gets hot and expands pushing open the lowest pressure check valve.
When the weather gets cooler it kinda goes away, problem is in Fl. it never completely goes away.
I have disconnected the meth line and plugged the openings and the problem is gone, I have looked for a stronger check valve and no luck.
Even installed 2 in line but it still happens.
Maybe someone else has an answer......
May have to convert to a solenoid.
The meth gets hot and expands pushing open the lowest pressure check valve.
When the weather gets cooler it kinda goes away, problem is in Fl. it never completely goes away.
I have disconnected the meth line and plugged the openings and the problem is gone, I have looked for a stronger check valve and no luck.
Even installed 2 in line but it still happens.
Maybe someone else has an answer......
May have to convert to a solenoid.
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
I had the same issue. I have the dual nozzle kit, large in line check valve and 1 just prior to each nozzle.
My issues went completly away when I switched to a SD tune. I'm not sure why, might have been something to do with the MAF being close to the nozzles leaking out small amounts of meth as described above.
Good luck tracking the issue down, mine drove me crazy for a good year...
My issues went completly away when I switched to a SD tune. I'm not sure why, might have been something to do with the MAF being close to the nozzles leaking out small amounts of meth as described above.
Good luck tracking the issue down, mine drove me crazy for a good year...
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
Here is link to one of my old posts that talk about the issue.
http://forums.corvetteforum.com/show....php?t=1814368
http://forums.corvetteforum.com/show....php?t=1814368
Melting Slicks
Joined: Nov 2003
Posts: 2,887
Likes: 2
From: Macomb MI
St. Jude Contributor
This happen to me the other day, my problem was my cap on the windshield tank, wasn't breathing correctly. My fault I didn't know it was a breather and blocked it off. Try cleaning it properly, see if that is your issue. When your car is running like it's on the test mode, take the cap off the tank and see if that corrects the problem, if it does clean the breather portion and that should fix your issue.
Instructor
Joined: Feb 2007
Posts: 172
Likes: 0
From: Harrisburg Pa
If I disconnect it, no problems. It has to be the heat from the TT setup but I figured that there would be more people having this problem. I just took everything apart this weekend and wrapped the lines. I have not had a chance to try this out yet.
Lets figure this out.
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Instructor
Joined: Feb 2007
Posts: 172
Likes: 0
From: Harrisburg Pa
I def. have meth leaking past after the fact. My cap is new with the vented hole but I will look at it again.
Thanks
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
This happen to me the other day, my problem was my cap on the windshield tank, wasn't breathing correctly. My fault I didn't know it was a breather and blocked it off. Try cleaning it properly, see if that is your issue. When your car is running like it's on the test mode, take the cap off the tank and see if that corrects the problem, if it does clean the breather portion and that should fix your issue.
What is the best method to clean that little vent?
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
Instructor
Joined: Feb 2007
Posts: 172
Likes: 0
From: Harrisburg Pa
Thread Starter
Instructor
Joined: May 2003
Posts: 205
Likes: 0
From: floral park ny
basically the meth is heating up and causing pressure in the system and while it sits it tends to drip into the intake tube and you get a hard start. same as when gas is vapor locking.
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
Went to start and same ol sh!!
So cleaning the vent did nothing, which makes sense because it's on the wrong side of the pump. (suction side)
I think what is needed is a 3#+ check valve at the nozzle.
That way when the meth expands it will be forced back into the pump instead of the intake tract.
Just a thought but why do we need a check valve in the pump anyway?
The pump is lower the the w/washer tank so it should always have meth all the way past the pump anyway. (cost savings)
Instructor
Joined: Feb 2007
Posts: 172
Likes: 0
From: Harrisburg Pa
Drove it yesterday, about 25 miles and shut it off long enough to have dinner.
Went to start and same ol sh!!
So cleaning the vent did nothing, which makes sense because it's on the wrong side of the pump. (suction side)
I think what is needed is a 3#+ check valve at the nozzle.
That way when the meth expands it will be forced back into the pump instead of the intake tract.
Just a thought but why do we need a check valve in the pump anyway?
The pump is lower the the w/washer tank so it should always have meth all the way past the pump anyway. (cost savings)
Went to start and same ol sh!!
So cleaning the vent did nothing, which makes sense because it's on the wrong side of the pump. (suction side)
I think what is needed is a 3#+ check valve at the nozzle.
That way when the meth expands it will be forced back into the pump instead of the intake tract.
Just a thought but why do we need a check valve in the pump anyway?
The pump is lower the the w/washer tank so it should always have meth all the way past the pump anyway. (cost savings)
I heat wrapped my line today and just got back from driving it so I will go out in a little while and see how it starts.
I will post back
Instructor
Joined: Feb 2007
Posts: 172
Likes: 0
From: Harrisburg Pa
Yep well I went out and tried to start my car after I let it sit for an hr and same ol crap...barely starts til it clears it out.
I give up. I have tried everything, check valves in the line, on the nozzles, re routed the line 3 times, put heat sleeve on it.
I don't know what else to try!
I give up. I have tried everything, check valves in the line, on the nozzles, re routed the line 3 times, put heat sleeve on it.
I don't know what else to try!
