STS, full throttle car falls on face.
06-09-2007, 02:36 PM
#1
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STS, full throttle car falls on face. I have an 01 WS6 with STS t67. All has been well on car. driving today and every once and a while I stomp it to floor in second or third and the car does nothing. No spool, seems like a fuel cut. car my increase 300 rpm's then just acts like I turned off the key, until I get totally off the gas and back on.
ANy idea?
ANy idea?
06-09-2007, 03:47 PM
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I'd check for exhaust leak or compressor side of turbo leak in piping for the no spool issue. I'd also check fuel pressure, spark, injector millisecs., MAP, MAF, if you have access to a scanner. Is the SES light on?
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06-09-2007, 04:12 PM
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does the engine die when you floor it, or does it just cut out and stumble, and when you mash the gas again, it comes back to life?
i'd say check the MAP sensor, and then everything electrical and make sure no connections are loose...
you need to describe it more as well....
i'd say check the MAP sensor, and then everything electrical and make sure no connections are loose...
you need to describe it more as well....
06-09-2007, 04:17 PM
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Did you drive through rain any time recently? I got stuck in a rain storm in Miami once and sucked water into the intake tube, and it got the MAF wet...it kind of did what you're saying. Luckily I had the FMIC at the time, and it trapped most of the water in there. But I would say check the MAF with the details we have right now.
06-09-2007, 06:44 PM
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you gotta be loosing some boost or something somewhere man, that just doesn't sound right. I put my kit together, took me 3 days off and on between food and breaks and BS'in ; BUT the first day i cranked it up it worked and boosted 5psi. check all of your lines, check your fuel, check your wideband out and see what AFR you are running, scan it or log it and see what spark your getting.
for it to just fall on its face....you gotta have something leaking or something else not working at all. i wish you luck in finding it and hope its something simple. thats a lot of somethings isn't it?! lol.
for it to just fall on its face....you gotta have something leaking or something else not working at all. i wish you luck in finding it and hope its something simple. thats a lot of somethings isn't it?! lol.
06-09-2007, 07:55 PM
#13
Is your battery tight it could be falling back once u hit it. I had that issue but some bungee cords fix that. Aslo how is your filter do u have the scok on it if so take it off and check your filter I runined a filter like that dam thing suck it self togather. If its stumbling alot check your intake pipe could be a bad check valve lettin oil on your maf had that issue befor also. Other than that plugs or vac lines.
06-09-2007, 09:00 PM
#14
This is always a fun one to solve.
I know you have a wideband, what does the a/f do when it does this?
If you roll into the throttle gently will it build boost?
My car will do the same thing if I pop a boot/pipe off, runs like a turd and acts like I hit a limiter. It will also do the same thing if you get water/oil on the maf. If your oil pump fails you'll fill up all your piping with oil and it will make it's way to the maf. You'll also have a big oil leak out the exhaust.
I know you have a wideband, what does the a/f do when it does this?
If you roll into the throttle gently will it build boost?
My car will do the same thing if I pop a boot/pipe off, runs like a turd and acts like I hit a limiter. It will also do the same thing if you get water/oil on the maf. If your oil pump fails you'll fill up all your piping with oil and it will make it's way to the maf. You'll also have a big oil leak out the exhaust.
06-11-2007, 06:31 AM
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Originally Posted by Zombie
This is always a fun one to solve.
I know you have a wideband, what does the a/f do when it does this?
If you roll into the throttle gently will it build boost?
My car will do the same thing if I pop a boot/pipe off, runs like a turd and acts like I hit a limiter. It will also do the same thing if you get water/oil on the maf. If your oil pump fails you'll fill up all your piping with oil and it will make it's way to the maf. You'll also have a big oil leak out the exhaust.
I know you have a wideband, what does the a/f do when it does this?
If you roll into the throttle gently will it build boost?
My car will do the same thing if I pop a boot/pipe off, runs like a turd and acts like I hit a limiter. It will also do the same thing if you get water/oil on the maf. If your oil pump fails you'll fill up all your piping with oil and it will make it's way to the maf. You'll also have a big oil leak out the exhaust.
Also, if the car is tuned too rich (ie getting TOO much gas, it will do the same thing.) Had that prob on my initial tune. A/F ratio via a wideband will answer that Q for you. Mine was so rich I could also smell the gas on decel. 
06-11-2007, 09:19 AM
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It seems to only happen if Im like staging and holding a certain rpm getting ready to floor it. Once I floor it, it seems to maybe move for a sec then totally dies out. As soon as I let up and get back on it will do the same thing. Wont do it if I ease into the throttle. Got to remember this doesnt happen everytime. Only seems to happen in first and second gear so far. Foot to floor and can hold to floor as I start to decel. I am hitting 10.8 every now and then on the WB when opening to full throttle. Checked all exhaust and intake piping. Electrical wiring too. No problems except a little oil coming out the breather on my PCV switch. When this is not happening car runs perfect and hawls *****. Even right after it happens I can get off and ease back in and all is good. Also can smell gas, checked trap door and all connections are good.
06-11-2007, 03:09 PM
#20
Originally Posted by Frost
It's fine until one day comes along and then it's the tune? They don't usually go bad 
It could be those damn tuning Leprechauns that come out from nowhere and destroy your tune when you're not paying attention
Still, it sounds like a fueling issue to me, which is controlled by the tune. I had a similar issue at one point b/c we were trying to lean out the injectors at idle and decel. We leaned it out so much that when you floored it, it would cut the fuel thus not allowing me to go anywhere unless I eased into the throttle. Especially in 1st gear...you'd be hard pressed not to stall it everytime you came to stop and then tried to go again
I also vote for data logging and then post the results.