4drturbo

Info:
Car starts right up when it has been sitting in the garage. No issues on cold starts when the car has been sitting for quite a bit of time. Now when the car has been sitting for about 40 minutes- 2 hours or so it does this



It happened after I had 60lb injectors, 2 bar MAP, new plugs and plug wires, BTR dual valve springs, Comp pushrods installed along with a HP tuners dyno and street tune from my tuner.

I took it to my tuner and he thinks my battery has a lot to do with it since it is a no name battery brand and around 2 years old from previous owner. He then adjusted a couple parameters on start up. So I installed a new gold series battery at AdvanceAuto and I still have the issue.

Car also will start right away on these warm starts...but it sounds like its about to die for a second, then comes to life. Sometimes it will just die and I will have to turn the key again. Anyone have any ideas?? Kind of driving me nuts. Everything else is great.

Dcollins3208

My car does the same exact thing in terms of trying to die on warm start. I have to lightly hold my foot on the gas for a bit at warm start up and it's fine. Spoke with my tuner and he said he can fix it, I just haven't had time to go. He said it's typical with a big cam and takes a few adjustments to get it right, especially since my car was tuned in cold weather

MVP'S ZO6

Next time you try to start the car after its warm try cycling the key on until the fuel pump quits whining then bump the key but don't start it then try to start it and see if it is still hard to start.

4drturbo

Yeah he said he couldn't really do to much since the HP tuner program doesn't really load up until start up. So its a guessing game on what to adjust.

So go to the "on position a couple times and the fuel pump will stop whining after cycling it?

I noticed on this car as opposed to other cars I have had, it literally starts right away. (cold start of course) Seems like it starts too quickly haha.

I will try the bump method, and then start it. Thanks for the suggestion

MVP'S ZO6

The reason I'm asking you to try that is an attempt to try and isolate something. I want to see if there's a possibility it's just an issue with the fuel system rather than the tune itself.


For example on my car in order for it to fire right up on cold start, I have to cycle the key on and off and or bump it to get it to fire right away. Other wise it's hesitant.

Dcollins3208

Do you have a FP gauge?

4drturbo

Mine starts perfect on a cold start. Car can sit 2 weeks and it will fire right up in my garage.

My issue is with a warm start. Doesn't happen all the time either on a warm start. But 8 out of 10 times it does.

BLOWNBLUEZ06

Sorry, not true.

Doesn't have to be a guessing game.

4drturbo

I will give him another shot at it, and if he can't figure it out I am taken it to another guy I heard good things about. All this has happened after the tune.

BLOWNBLUEZ06@RKT Performance

I would get your money back. If he says it's something else and not in the tune, then offer him this: You get the tune changed and the problem solved, you get your money back. If it's mechanical, he gets an apology.


If you want to get a HP Tuners module from me, I can fix it remotely. I offer 30 minutes of tutorial time with the module purchase. You can use it toward that if you like. I'm fair if it takes longer. When I charge for a tune, IF the issue is tune related and I can't solve it, money back.
I've tuned two supercharged C5's local to you. They might be willing to loan you their module with a proper security deposit.

backnblack2003z06

I would take Bret up on his offer. He knows how to tune and is absolutely right on HP tuners being able to read during cranking.

a/c man

I agree he can tune.

MVP'S ZO6

^^^^^

4drturbo, hearing your tuner say he has no other alternative than to guess makes me cringe. I hate to assume that it's automatically a tune issue but if it wasn't doing it before you added injectors and a 2 bar MAP then it may very well be especially if those two things were not accounted for. It's tough to know exactly what the issue is without data though. So, I say you get ahold of HPT if you can and let Bret Blownbluezo6 help you out. You won't regret it.

4drturbo

Let me shed a bit more light on the situation. When I brought the car to him, we waited like 15 minutes, and it started right up. He adjusted a couple things and told me my battery was a no name battery and it would probably be a good idea to get a new battery since, we did like 5-6 start ups, and the battery died. Car wouldn't start at all. Thats why he told me to get a new battery. Its just such an odd situation and when I brought it to him I couldn't replicate the weird starting issue. He never said there was no alternative other then to guess. But that is what I got along those lines....Car had to sit for longer. Here is a cold start:

Well said. I just need to find time and a nice day to see and set something up and give him one more chance. I don't own a HPT or have a wideband in the car. Car is on a very conservative tune. If he can't figure it out I will take it to Justne performance, heard good things about him. If he can't fix it I will go your route. Thank you very much for the offer. Right now, since I don't drive the car that much, it isn't a major priority.

Milan

Car needs RussK idle config. Basically your idle airflow values are off, show your tuner my post:

http://www.hptuners.com/forum/showth...l=1#post223853

Edit: Also tell your tuner he can start scanning BEFORE you turn on the car, it doesn't have to be on first.

Edit again: sending you a PM