2nd Generation Specific 1986-1992 Discussion

Need suggestions on S5 TII hard starting

Old 01-26-2006, 10:25 AM
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Ok here's the deal...I have a 91 TII that Ive owned for 1 yr, its been flawless. The car has recently developed a hard starting issue. If I leave the car for 10 min and then come out and start it up it takes about 15 - 20 seconds of cranking before it starts. If I leave the car overnight and start it in the morning it takes about 5 - 10 seconds of cranking before starting. This car has always fired within a second or two.



It idles perfectly, has lots of power and doesnt smoke. Typically after cranking a car that long you should have some smoke from excess fuel but not this car...Which kinda makes me think some type of fuel issue is happening. I have a new fuel filter and RP pump that have been on the car for about 1,000 miles. My mods are listed below. Any help you guys can offer is greatly appreciated.



Chris
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Old 01-26-2006, 10:38 AM
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First off, sounds like a sweet ride...got any pics w/ that offset wheel setup?



Secondly, the hard start may actually be because of leaking injectors. Even though your not seeing smoke...it may be the case. If an injector is stuck open for too long it'll leak fuel into the chamber, causing a slight flooding when you go to crank it.



Another problem is that it might just need new plugs. Have you tuned it up lately?
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Old 01-26-2006, 10:46 AM
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Originally Posted by One320B' post='796507' date='Jan 26 2006, 08:38 AM

First off, sounds like a sweet ride...got any pics w/ that offset wheel setup?



Secondly, the hard start may actually be because of leaking injectors. Even though your not seeing smoke...it may be the case. If an injector is stuck open for too long it'll leak fuel into the chamber, causing a slight flooding when you go to crank it.



Another problem is that it might just need new plugs. Have you tuned it up lately?


If you go to Teamfc3s.org you can see pics, lots of them.



I thought about it being leaking injectors but then wouldnt it be harder to start sitting overnight vs for 10 minutes?



Plugs are NGK 9's all the way around and have about 5,000 miles on them.



I was thinking that I will test the voltage at the fuel pump when the car is in the 'ON' position and then when cranking. If Im not getting 11volts when in 'ON' but I am when cranking then that must be it. Possibly a fuel relay issue?
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Old 01-26-2006, 11:12 AM
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Originally Posted by Rotorlution' post='796509' date='Jan 26 2006, 11:46 AM





I thought about it being leaking injectors but then wouldnt it be harder to start sitting overnight vs for 10 minutes?




Nope. Mine was always hardest to start right after a short shutdown--a fuel stop, for example. Leaky injectors would be my first guess. Also, 5000 mile plugs are far from new in a rotary. You might see some improvement from new ones or cleaning the ones you have.
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Old 01-26-2006, 12:09 PM
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Originally Posted by 1988RedT2' post='796514' date='Jan 26 2006, 09:12 AM

Nope. Mine was always hardest to start right after a short shutdown--a fuel stop, for example. Leaky injectors would be my first guess. Also, 5000 mile plugs are far from new in a rotary. You might see some improvement from new ones or cleaning the ones you have.


So you had your injectors cleaned and you didnt encounter the problem again?



See here is where I have a problem....Rich is rich no matter whether its a piston or rotary. If the injectors are leaking enough that its causing the car to take an unusually long time to start then that tells me I should have some black smoke out the pipe when it does fire, at the very minimum some gas fumes...I have neither of those. As far as plugs go, if it were plugs my car would run like crap and most likely not idle very well... But this car has gobbs of power and idles very smoothly.
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Old 01-26-2006, 03:18 PM
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Originally Posted by Rotorlution' post='796529' date='Jan 26 2006, 01:09 PM

So you had your injectors cleaned and you didnt encounter the problem again?




Actually, I installed a Haltech, bigger secondaries, and clean primaries and haven't encountered the problem since. I'm assuming it was leaking injectors. I understand it's a very common problem.
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Old 03-19-2006, 10:11 AM
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Hey Chris I would have a compression checked. This hole time you have been running without a boost gauge. So you never know what you are boosting. If compression test good than I would have the injectors cleaned by rc engineering. Just less of a hassel to pull the injectors whenn it could be a compression problem
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Old 03-19-2006, 11:23 AM
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Originally Posted by fc3s91' post='808624' date='Mar 19 2006, 11:11 AM

Hey Chris I would have a compression checked. This hole time you have been running without a boost gauge. So you never know what you are boosting. If compression test good than I would have the injectors cleaned by rc engineering. Just less of a hassel to pull the injectors whenn it could be a compression problem




What he said. Get it compression tested. Hot compression is lower than cold compression. This is why you'll hear of hot start issues like this. The fuel cut toggles people install are many times bandaids for the real problem of low compression and not so much a fix for an actual injection issue.
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Old 03-19-2006, 06:42 PM
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Interesting. Pics?
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