peter donnelly
Newbie
I have a 1998 k1500 suburban 5.7 vortec that refuses to start. Just a bit of background, i am a mechanic by trade and have owned the truck 4 years but im in england so getting parts just to try is a bit of a pain with a long wait.
The truck has been running fine until i sat it up about a month ago, fired it a few times since then, and it struggled to run, and now it refuses.
I noticed that my fuel pressure was a bit low so i have replaced the pump and also fitted a new ac delco mfi spider unit. i know have 58 psi with ignition on, and holds at 62 psi when cranking even though the truck doesnt even try to fire. i have checked compression which is all good and checked that the timing hasnt jumped.
I have spark although the pattern to the spark is a little weird.
The craziest think is if i just flick the key in half a second bursts the car tries to fire, and i have managed to get it to eventually start if i keep doing this for around 5 mins, when it does fire it runs perfect, but turn it of and it does the above again.
It is the strangest fault ive seen, and leads me to believe that cranking is somehow upsetting something, if i hold the key in the start position it will not hint at firing.
Also plugged on with obd, and on crank im getting 120rpm, is this normal or two low, my battery is also at 10.8v on crank which i assume is acceptable.
Sorry for the long write up just hoping someone can shed some light for me..
Thankyou
The truck has been running fine until i sat it up about a month ago, fired it a few times since then, and it struggled to run, and now it refuses.
I noticed that my fuel pressure was a bit low so i have replaced the pump and also fitted a new ac delco mfi spider unit. i know have 58 psi with ignition on, and holds at 62 psi when cranking even though the truck doesnt even try to fire. i have checked compression which is all good and checked that the timing hasnt jumped.
I have spark although the pattern to the spark is a little weird.
The craziest think is if i just flick the key in half a second bursts the car tries to fire, and i have managed to get it to eventually start if i keep doing this for around 5 mins, when it does fire it runs perfect, but turn it of and it does the above again.
It is the strangest fault ive seen, and leads me to believe that cranking is somehow upsetting something, if i hold the key in the start position it will not hint at firing.
Also plugged on with obd, and on crank im getting 120rpm, is this normal or two low, my battery is also at 10.8v on crank which i assume is acceptable.
Sorry for the long write up just hoping someone can shed some light for me..
Thankyou
