Re: Takes a long time to start after sitting in the cold weather ---
 

Lately after my car sits for a few weeks it will start instantly,its a little unnerving considering the oil hasn't has a chance to pump up.Marc H says its nothing to worry about so I guess its no big deal just cant understand why all of the sudden its doing this.My first thought was a leaky fuel injector.

Re: Takes a long time to start after sitting in the cold weather ---
 

Sounds like a leaky injector to me too ---

Re: Takes a long time to start after sitting in the cold weather ---
 

I'd sure be careful about that. Who knows what the vibrations will be at the end of the rail. You get a leak and you're looking at a fire.

Pressure should be ~50psi but it really depends on the brand and age of the pump(s) you have. If you get down to around 40psi you've got problems. There is a special pig tail between the motor and the battery that can be used (with key off only) to test the fuel pressure. I hooked up a permanent switch on it for testing. It keeps the pump running. For a real run down on testing see the FSM.
If you don't have one yet we can help with that.

Re: Takes a long time to start after sitting in the cold weather ---
 

I have a CPT "LT5 Engine-Mechanical" booklet (white), and a SERVICE MANUAL SUPPLEMENT "1990-1993 Corvette RPO LT5" booklet (red) .

Time to start reading when I can find the spare time :) ---

Re: Takes a long time to start after sitting in the cold weather ---
 

So you don't have the regular service manual?

Re: Takes a long time to start after sitting in the cold weather ---
 

Honestly, it may be timing and compression just by the luck of the draw, so to speak, as the motor is shut off. This happens to me regularly enough.

Yes, it kinda takes you by surprise. I don't like it because I always like a longer cranking time in order to get some oil to the top of the heads, even though I have the check valve in the oil filter. And when this instant start happens, it always seems that the rpms are high initially, as well.

I spoke to both Pete and Marc about it and was told not to be concerned.

I also studied the old Lotus engine build data that I have. Their data showed 5 seconds to build oil pressure upon start-up. This was only one example.

Re: Takes a long time to start after sitting in the cold weather ---
 

[QUOTE=Blue Flame Restorations;157736]Honestly, it may be timing and compression just by the luck of the draw, so to speak, as the motor is shut off
/QUOTE]

Its a little odd that this would just start happening now after having the car for awhile now.Something else to take into account twice now in the last couple off months for a few seconds the car wasnt running on all cylinders,felt like it fouled a plug but it cleared up,straightened out.Might be an injector going South.:(Ive got a Haibeck chip and I was under the impression that a touch of extra crank time was programmed into the chip.Oh well,if those in the know said its not a problem,thats all I need to know.:-D

Re: Takes a long time to start after sitting in the cold weather ---
 

I guess not ... unless that's the book that most people keep in the car with them. I have a 1990 Corvette book in the glovebox.

What other literature do you suggest that I pickup?

Seems that my start time is not too much to worry about. Do ported engines usually take longer to fire up? It may be the LPE chip too I guess?

Could be the cold weather too , I will see how she responds this summer.

I appreciate it ---

Re: Takes a long time to start after sitting in the cold weather ---
 

First, Jingle Bells!

try this link.

http://www.helminc.com/helm/product2...T5K&itemtype=K


:cheers:
Tom

Re: Takes a long time to start after sitting in the cold weather ---
 

Here is a link to many sources for the FSM (field service manual)
http://www.zr1netregistry.com/Inform...e-Manuals.aspx

Start time seems well within reason. Try the various methods suggested to shorten the time. Just don't let go of the key too early for reasons mentioned.