Subject	50psi cranking seems high.
Posted by	MLPS300ZX on May 20, 2019 at 10:55 PM
	This message has been viewed 261 times.
In Reply To	I did a fuel pressure test today. posted by BannonZ on May 13, 2019 at 02:57 PM
Message	It should be about 43psi during cranking and drop down to 37 after it has vaccum at idle. Although that difference does not seem like it would be causing this issue. At idle when you remove the vaccum line from the FPR it should bring the pressure back up to 43psi. Random things to double check: Throttle position sensor (hard idle switch) Fuel Temp Sensor Steps to double check the hard idle switch on the TPS. https://conceptzperformance.com/wiki/index.php/Throttle_Position_Sensor
Follow Ups	Starting issue: Continued - BannonZ 09:58:50 05/11/19 More parts replaced - BannonZ 10:23:36 05/11/19 Fuel pump controller unit? - FrozTTy 11:02:40 05/11/19 hmm - BannonZ 11:32:09 05/11/19 Did you bypass the FPCM? (n/m) - FrozTTy 09:35:28 05/14/19 Not yet. (n/m) - BannonZ 11:45:22 05/15/19 Re: Fuel pump controller unit? - Metacom 16:07:09 05/11/19 Yes - BannonZ 19:24:48 05/11/19 Check this thread out - Cjw3 11:39:57 05/11/19 Definitely has similarities. It hasn't been more than 50 f - BannonZ 13:12:55 05/11/19 Re: Definitely has similarities. It hasn't been more than 50 f - Cjw3 14:07:42 05/11/19 Re: Starting issue: Continued - MLPS300ZX 21:29:07 05/12/19 Re: Re: Starting issue: Continued - MLPS300ZX 21:34:28 05/12/19 Where is this valve located? (n/m) - FrozTTy 08:31:18 05/13/19 This one? - BannonZ 11:49:27 05/13/19 Yes that, but I'm wondering where it is on the car... (n/m) - FrozTTy 15:37:09 05/13/19 That's it. It's on TTs only. I have a fuel pressure gauge... - MLPS300ZX 14:45:40 05/13/19 I did a fuel pressure test today. - BannonZ 14:57:57 05/13/19 Is your chip setup for dual or single pop? - MLPS300ZX 16:50:31 05/14/19 I also brought this up (below) - FrozTTy 17:02:25 05/14/19 I was using a Specialty Z chip with dual pop and set up for - BannonZ 09:46:37 05/15/19 50psi cranking seems high. - MLPS300ZX 22:55:49 05/20/19 To back up a little for diagnostic purposes: When did the - SirpriZ 15:33:12 05/13/19 I have had this problem, getting progressively worse since - BannonZ 07:52:20 05/14/19 You've ruled out alot of potential issues: It isn't the - SirpriZ 18:35:43 05/14/19 Thank you for your help. - BannonZ 09:37:07 05/15/19 YW I don't think an internal engine issue would cause all - SirpriZ 15:09:32 05/15/19 What about the wiring that relocated PTU? - FrozTTy 09:34:04 05/14/19 When I put the new PTU in I replaced the harness with a - BannonZ 09:39:32 05/15/19 Silly question, but are you sure the gas is good? (n/m) - ZBOOSTT 14:13:38 05/15/19 I don't keep more than a quarter tank in the vehicle - BannonZ 14:44:09 05/15/19 Try one gallon of Toluene and that will clean the injectors - ZBOOSTT 18:59:51 05/20/19 Update - BannonZ 15:59:22 05/21/19 That's a shame. At least you'll have a definitive idea of - SirpriZ 19:46:17 05/21/19 That's a bummer! Keep us posted! (n/m) - MLPS300ZX 02:54:25 05/22/19 Thanks guys, I will let you know. - BannonZ 07:26:51 05/22/19 GL let us know what's next (n/m) - FrozTTy 08:19:25 05/23/19
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