87' Long Crank

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Jun 1, 2024 | 10:47 PM

CiniTGS

Thread Starter

Heel & Toe

Joined: May 2024

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87' Long Crank

Any ideas on what could be causing a long crank? When it's running she runs great. It's only sometimes when it's cold that it cranks for abnormally long.

Thanks!

Jun 2, 2024 | 09:05 AM

Tunedport90

Melting Slicks

Joined: Aug 2011

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CSI operating ?

Jun 2, 2024 | 11:33 AM

jdjenk

Instructor

Joined: Jan 2021

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If its like mine, fuel in the fuel lines is draining back to the tank when you turn it off. Pump is supposed to stop this but its bad in mine.

Not a big deal, just turn the key on and let it pump fuel for a few seconds before you start cranking.

Jun 2, 2024 | 05:29 PM

CiniTGS

Thread Starter

Heel & Toe

Joined: May 2024

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How would I test this?

Jun 2, 2024 | 05:53 PM

Whaleman

Safety Car

Joined: Mar 2017

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From: LeClaire Iowa

My 96 developed this and it was the fuel pump. Dan

Jun 2, 2024 | 07:14 PM

jdjenk

Instructor

Joined: Jan 2021

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Quote:

Originally Posted by CiniTGS

How would I test this?

Toss a fuel pressure gauge on. Turn the key on. You'll see the pressure go up and then quickly off if you have this issue. Theres a spec in the manual somewhere for how long it should have pressure, but you'll know.

If it does bleed off fast, its either the FPR or its flowing back to the tank. If its the FPR you'll probably have fuel in the vacuum line, and if your car is running fine its probably just the pump letting it back in the tank.

Jun 7, 2024 | 07:05 PM

CiniTGS

Thread Starter

Heel & Toe

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@jdjenk @Whaleman Thanks for your help guys. I replaced the fuel pump today and now she's running like a beaut. I appreciate the help!

Jun 11, 2024 | 01:31 PM

CiniTGS

Thread Starter

Heel & Toe

Joined: May 2024

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Ok, I may have spoken to soon. It looks like it still happens but now only when the engine is warm. It cold starts no problem. I did notice a significant improvement in acceleration with the new fuel pump though.