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Weak coils = poor hot engine start?
Can weak/failing coils cause an engine to not start when hot, but start with no problem when cold?
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Certainly possible. That or compression.
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Or a problem with the pressure regulator control valve or a bad water thermosensor are two other possibilities.
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If you can bump the key to start (as in just, quickly tap the start position with the key) and then actually try and start the car and it fires right up, you have a fuel pressure issue.
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+1 on compression
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Originally Posted by jjwalker
(Post 12112568)
If you can bump the key to start (as in just, quickly tap the start position with the key) and then actually try and start the car and it fires right up, you have a fuel pressure issue.
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Originally Posted by Fuhnortoner
(Post 12112576)
+1 on compression
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Originally Posted by freq
(Post 12112578)
What does bump starting the car do? Does it give it an initial shot of fuel? FYI-I'm running a Haltech Sprint RE.
The FC ignition system is very stout and big, the only thing I can think of that may be a problem with it is from what I have read in the past, is Haltech computers hate the stock CAS. |
Originally Posted by jjwalker
(Post 12112581)
I missed the aftermarket computer part. On a stock car, it causes the fuel pump to prime the system for 3 seconds.
Also, now that I'm thinking about it, I think I remember having to adjust that map a bit higher for the higher temps in order for easier starting. --so, a failing fpr will have a hard time pressurizing at higher temps? |
Originally Posted by freq
(Post 12112584)
Ok. There's a map called Prime Pulse Time in my Haltech that does something similar. Not sure if it's 3 seconds, but it does prime the system. I'll give that a shot.
Also, now that I'm thinking about it, I think I remember having to adjust that map a bit higher for the higher temps in order for easier starting. --so, a failing fpr will have a hard time pressurizing at higher temps? I had the same problem but could bump the key and fire the car right up. Weirdly enough, my fuel pump upper o-ring failed and was bleeding all the fuel back into the tank. |
Originally Posted by freq
(Post 12112584)
Ok. There's a map called Prime Pulse Time in my Haltech that does something similar. Not sure if it's 3 seconds, but it does prime the system. I'll give that a shot.
Also, now that I'm thinking about it, I think I remember having to adjust that map a bit higher for the higher temps in order for easier starting. --so, a failing fpr will have a hard time pressurizing at higher temps? On a hot start there should be no vacuum on the hose connected to the FPR (no vacuum situation lasts for close to a minute depending on the model), otherwise there should always be vacuum. |
Originally Posted by satch
(Post 12112619)
If you are referring to the pressure regulator control valve it is a separate item from the fpr. The valve is used in hot starts as it adds pressure to the fuel system.
On a hot start there should be no vacuum on the hose connected to the FPR (no vacuum situation lasts for close to a minute depending on the model), otherwise there should always be vacuum. https://cimg2.ibsrv.net/gimg/www.rx7...ef5448d93a.gif |
Originally Posted by freq
(Post 12112629)
Are you referring to #3 in the diagram? I don't have any of those solenoids. Haven't had them for several years now. I'm assuming that since this is a recent problem, that the Pressure Regulator Control Solenoid Valve isn't the issue. Please correct me if I'm wrong.
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