Hard starting after warm up
Thread Starter
Cruising
Joined: Jun 2003
Posts: 10
Likes: 0
From: Newtown Square PA
Hard starting after warm up
My 85 coupe L98 engine starts ok when cold. But when up to temperature the engine is hard to start after being shut off for 15 minutes or more. I am able to start the engine by depressing the accelerator about 1/2 way. If I stall the engine (4+3 tranny) it will start immediately. I have checked most of the connectors and have jiggled the wirers. Any thoughts and approaches?
Safety Car
Joined: Jan 2003
Posts: 4,902
Likes: 19
From: Tavernier Fl
Re: Hard starting after warm up (hillb)
Mine does the same thing, I am going to do the fuel pump relay, do a good tune-up and if thats not it i suppose I will checi the injectors, they could be leaking down fuel pressure once that car is off a few min
Ben
Ben
Burning Brakes
Joined: Jun 2003
Posts: 1,229
Likes: 1
Re: Hard starting after warm up (belmor)
This is on the tech tip section, it might be a good idea to try this first.
Another tip from a Gordon Killebrew lecture during Corvettes at Carlisle 2001. Say your L98 starts right up after sitting for a long while, such as overnight, but is hard to start after sitting for a little while. Before trying to start it, hold the accelerator to the floor for a brief period and release it. If the engine then starts right up it's a sign that an injector may be leaking, causing a flooding condition. Holding the throttle plates open allows some of the excess fuel vapors to escape, which removes some of the accumulated excess fuel and makes the engine easier to start.
Another tip from a Gordon Killebrew lecture during Corvettes at Carlisle 2001. Say your L98 starts right up after sitting for a long while, such as overnight, but is hard to start after sitting for a little while. Before trying to start it, hold the accelerator to the floor for a brief period and release it. If the engine then starts right up it's a sign that an injector may be leaking, causing a flooding condition. Holding the throttle plates open allows some of the excess fuel vapors to escape, which removes some of the accumulated excess fuel and makes the engine easier to start.
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Hard starting after warm up (hillb)
Hard startups when warm is usually an injector failure, hook up a pressure gauge at the fuel rail and shut the car off, the pressure should hold a good while.
If it drops, one or more is leaking into the cylinder. If that happens you can either replace all 8 or have all 8 sent to Rich at CruzinPerformance for cleaning. You MUST do all 8, if ones bad the rest will follow.
If it drops, one or more is leaking into the cylinder. If that happens you can either replace all 8 or have all 8 sent to Rich at CruzinPerformance for cleaning. You MUST do all 8, if ones bad the rest will follow.
Burning Brakes
Joined: Jun 2003
Posts: 1,229
Likes: 1
Re: Hard starting after warm up (vader86)
I actually have a hard starting problem myself at times.
I'll probably have all the injectors replaced sometime this summer.
Can any one recommend a particular brand of injectors? and I already know about the ford injectors, but the word ford, and them being pink doesn't really sound or look good.
I saw these called TPI Design III - 22lb injectors http://www.fiveomotorsport.com/Injector_SetsTPI.asp
Has anyone ever tried these injectors before? are they any good?
I'll probably have all the injectors replaced sometime this summer.
Can any one recommend a particular brand of injectors? and I already know about the ford injectors, but the word ford, and them being pink doesn't really sound or look good.
I saw these called TPI Design III - 22lb injectors http://www.fiveomotorsport.com/Injector_SetsTPI.asp
Has anyone ever tried these injectors before? are they any good?
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Hard starting after warm up (TheStef)
Stef dont replace your stockers with 22's if youre puttin in the 219 and SR, with a 383 underneath youll likely need 24s at least.
