Take for ever to start and then sometimes?

WANETA

MEMBER
1995 GMC JIMMY
6 CYL
4WD
AUTOMATIC
172,000 MILES

Take for ever to start and then sometimes it starts right up but most of the time it takes for ever to start but this only happens if it sits to long cause wonce it starts I can go do my running and each time I get back in it it starts right up it takes for evey to start if its sat for a while - something to do with fuel system - its not the fuel pump or filter so what could it be

1 Reply

SQM

MECHANIC
6,383 POSTS

Hello,

There could be a number of reasons why the engine is hard to start.
It could be due to a weak fuel pump, dirty throttle bore, torn intake boot, worn out spark plugs, low cylinder compression etc.

The best course of action would be to take a look at each item and take necessary action. Like cleaning the throttle body, replacing spark plugs, checking the compression, and testing the fuel pressure.

Here is a helpful guide:

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

If you are only having this issue when the vehicle sits for a long time, it could be due to a fuel issue. Like a malfunctioning pressure regulator not working properly when cold.

Checking the fuel pressure when the engine is cold might provide you with an answer.
This vehicle should have 58-64 PSI of fuel pressure with the key on and engine off.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Please let me know if you have any questions.
Thank you.

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