hard starting after running/warmed up!

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Captain Morgan

Moderated User
Re: hard starting after running/warmed up!

you never answered my question about having your old chip or not.... do you? or did you sell it?
 
BoostedSUV

BoostedSUV

Active member
Re: hard starting after running/warmed up!

Necro, I ran that relay ECM voltage fix last summer because under high levels of boost voltage was dropping to the ecu. With the datamaster hooked up I see 13.9 at WOT now as opposed to 12.5.
 
BoostedSUV

BoostedSUV

Active member
Re: hard starting after running/warmed up!

Captain Morgan said:
you never answered my question about having your old chip or not.... do you? or did you sell it?
Click to expand...

I no longer have the stock injectors but I still have my stock chip. Its piggy backed with my Moates stuff and Nolan chip. I think I still have my ultimate and
10n1 chip too but they aren't the proper tune for my combo . A while back I noticed my stock chip has a small motherboard piece attached and some of the prongs seperated so I soldered them back together. Not sure if that would have anything to do with startup? That's been "fixed" for some time now
 
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Captain Morgan

Moderated User
Re: hard starting after running/warmed up!

BoostedSUV said:
I no longer have the stock injectors but I still have my stock chip. Its piggy backed with my Moates stuff and Nolan chip. I think I still have my ultimate and
10n1 chip too but they aren't the proper tune for my combo . A while back I noticed my stock chip has a small motherboard piece attached and some of the prongs seperated so I soldered them back together. Not sure if that would have anything to do with startup? That's been "fixed" for some time now
Click to expand...

so how long ago did you do away with your other setup? Im kinda confused here, I dont care about the stock injectors, Id be willing to bet on the fact that the problem would go away if you went back to stock injectors and stock chip.

What im trying to get at is... did at some point over the 2 years youve been running your 50#'ers, did you change the chip setup? If you did, can you temporarily go back to that, even if its not 100% tuned for your current build, stay out of the boost and just go for a light throttle cruise, get the engine to normal operating temps, turn the truck off and see if the starting issue exists with your old chip setup??
 
BoostedSUV

BoostedSUV

Active member
Re: hard starting after running/warmed up!

Gotcha... In the last 8 months I bought moates stuff and had Nolan work with me to burn a chip. I think all I have is a stock chip and I will try to dig up my ultimate (which had its own issues) and see if its a chip issue. I never had a problem with the 50#ers prior
 
BoostedSUV

BoostedSUV

Active member
Re: hard starting after running/warmed up!

Just went out during my lunch break and let the truck idle for a while then shut off. Went to refire it and it started like crap and idled rough like it was loading up with fuel. I let it clear out, turned truck off, took stock chip off moates adapter and fired it up with stock chip only. Truck started right and idled perfect. I'm not 100% convinced so I will try it later after driving a while. What's next? Contact Nolan to reprogram startup sequence?
 
AutoVation

AutoVation

Member
Re: hard starting after running/warmed up!

What you guys are describing sounds exactly like fuel rail vapor lock. I'm not saying that is the issue but I would be surprised if it wasn't. Note that injector design does play a factor in this issue.
 
BoostedSUV

BoostedSUV

Active member
Re: hard starting after running/warmed up!

what's the test/solution? I just datalogged the truck and sent it to Nolan to see if he sees anything
 
AutoVation

AutoVation

Member
Re: hard starting after running/warmed up!

BoostedSUV said:
what's the test/solution? I just datalogged the truck and sent it to Nolan to see if he sees anything
Click to expand...

If your car starts with no problem when cold but has issues starting when it is warm, it is most likely vapor lock.

Here's a solution from another website:

Start by checking the fuel rail pressure, to be sure it’s in spec. Lower pressure=lower boiling point.

But what ultimately tamed it for was to add a couple of feet to the fuel return line to the tank, and wrap that around the a/c line. Pick the colder line from the evaporator, unwrap the insulation parallel the fuel line and a/c line for a foot or two, and reinsulate carefully.

This works out well, because the fuel only gets cooled when the a/c is on, which is when it’s hottest.
 
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Captain Morgan

Moderated User
Re: hard starting after running/warmed up!

BoostedSUV said:
Just went out during my lunch break and let the truck idle for a while then shut off. Went to refire it and it started like crap and idled rough like it was loading up with fuel. I let it clear out, turned truck off, took stock chip off moates adapter and fired it up with stock chip only. Truck started right and idled perfect. I'm not 100% convinced so I will try it later after driving a while.
Click to expand...

so whats it gonna take to convince you 100%?

i mean you changed the chip and it went from crappy to good.

have you tried running with the other chip and starting the truck while it was hot?

If it starts fine, then its not any sort of vapor lock, its the chip!
 
BoostedSUV

BoostedSUV

Active member
Re: hard starting after running/warmed up!

Ok I found the problem but I need a solution! I hooked the laptop up and datalogged the hard start up. Once the truck warms up and I try to restart it the rpm reads 6300 and the injectors go to 96 percent cycle duty while cranking. It will not start unless I hold it WOT. The ecu sees 6300 rpm during cranking and is dumping fuel into the cylinders. Once the truck starts and clears out the RPMs read perfect... Any ideas?
 
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Captain Morgan

Moderated User
Re: hard starting after running/warmed up!

again, does it do it with both chip setups???

I never did the datalogging on startup, but I know it does start quicker if I pin the pedal to the floor like a carb'd vehicle, now I know why.
 
BoostedSUV

BoostedSUV

Active member
Re: hard starting after running/warmed up!

I didn't try it with the stock chip. Nolan didn't seem to think it had anything to do with the chip or tune. Its exactly like starting my carburated el camino, have to hold it WOT to start it if it floods...
 
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Captain Morgan

Moderated User
Re: hard starting after running/warmed up!

BoostedSUV said:
I didn't try it with the stock chip. Nolan didn't seem to think it had anything to do with the chip or tune. Its exactly like starting my carburated el camino, have to hold it WOT to start it if it floods...
Click to expand...

try it with the other setup, if it doesn't do it, then you know where your problem lies.

I know Nolan knows what he is doing, so does the guy who wrote my chip, so there has to be some other reason why the same exact thing happens on 2 different trucks. Perhaps there is a bad base .bin file out there, who knows, but trying other things and isolating the issue is the only way its gonna get solved.
 
BoostedSUV

BoostedSUV

Active member
Re: hard starting after running/warmed up!

Captain you are absoluletly right. It's the chip. I went back and forth with datalogger monitoring 10 times from nolan/moates stuff to factory chip by itself. Everytime (once warmed up) the truck cranked and rpms jumped to 6300 then back down, then back up to 6300. It spraying fuel like crazy and flooding the motor. With the factory chip by itself... nothing, fired right up every time with no erratic rpm readings. It doesn't show up on the tach but it cleary shows it on datamaster. Aside from the hard stating this truck runs awesome. I would hate to go backwards to fix this issue....
 
10secTy

10secTy

Sy-Ty builder and Tuner
Re: hard starting after running/warmed up!

I will send you a totally differnt bin file to try. My other thoughts are that it could be the piggy back board. I have had one or two in the past that had problems. I have also seen something similar to this and it turned out to be teh MSD dist we will not use them any more period. Can you take some datalogs cranking it with the stock chip in it?

Nolan
 
BoostedSUV

BoostedSUV

Active member
Re: hard starting after running/warmed up!

Nolan I will try to get some datalogs of cranking with both the stock chip and moates stuff. I had this same issue from time to time with the factory dist as well as with the MSD. If it was with MSD distributor it should do it with either chip during cranking I would think.
 
BoostedSUV

BoostedSUV

Active member
Re: hard starting after running/warmed up!

I tried to prove the chip thepry by data logging the hard starting the other day switching chips back and forth. Of course this time it was giving me a hard time with both chips!! Now I'm guessing I'm back to square one... any more ideas?
 
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