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Cranks but 80% of the time will not start

Garrett
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Garrett Member

Garrett

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Hi guys, I have a 2003 Boxster 2.7 that has starting issues. I can get it to start by bypassing the fuel pump relay with a jump wire, but it doesn't seem to run right when I do. Relay is good, MAF  sensor new, fuel pump new last year but it's not a genuine Porsche part. CPS sensor good. When it does start after a long crank time it slowly coughs and stumbles to life, but then runs fine. No codes. Indy thinks it might be immobilizer. Last week it started fine for about 4 starts. I'm stumped. Thank you for any help. Garrett. 

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JFP in PA Member

JFP in PA

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10 hours ago, Garrett said:

Hi guys, I have a 2003 Boxster 2.7 that has starting issues. I can get it to start by bypassing the fuel pump relay with a jump wire, but it doesn't seem to run right when I do. Relay is good, MAF  sensor new, fuel pump new last year but it's not a genuine Porsche part. CPS sensor good. When it does start after a long crank time it slowly coughs and stumbles to life, but then runs fine. No codes. Indy thinks it might be immobilizer. Last week it started fine for about 4 starts. I'm stumped. Thank you for any help. Garrett. 

 

What kind of fuel pressure and delivery rates are you seeing?

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Garrett Member

Garrett

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JFP, unfortunately I don't have that data. The other day I got it started with the jumper wire, while it was at idle I pulled out the jumper wire, expecting a quick stall, but the car ran for 5-6 seconds before starving of fuel. Not sure if this info helps. Thanks for your time and input. 

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Garrett Member

Garrett

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Just now tried the "indy" recommended immobilizer reset. Crank but no start. So I put the jumper wire in to bypass the fuel pump relay and after several seconds of sounding like it might start it finally did ( 2 turns to start with about 4 seconds of crank over time). I then brought it to a smooth idle and while it was running I pulled the jumper out and installed the relay. It didn't stall and it's in the drive right now running. Help?

Thank you for any suggestions. 

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Garrett Member

Garrett

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Sorry been out on vacation. Just did a fuel pressure check. 8 psi at crank, 18 with jumper wire, ran like crap at 20 psi, then the pump started working "good" and pressure went to 55, and car ran fine.  Ordering a new pump now. JFP thanks for your help. 

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JFP in PA Member

JFP in PA

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30 minutes ago, Garrett said:

Sorry been out on vacation. Just did a fuel pressure check. 8 psi at crank, 18 with jumper wire, ran like crap at 20 psi, then the pump started working "good" and pressure went to 55, and car ran fine.  Ordering a new pump now. JFP thanks for your help. 

 

 

Anytime.  As often quoted, the devil is always in the details...…………….

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