vortech guys who upgraded to 42's and lmaf, come inside

blownlxvert

blownlxvert

New Member
Nov 3, 2005
48
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endicott n.y.
#1
i upgraded this winter to 42lb injectors ans a lmaf along with a powerpipe, areomotive adj reg. and a walbro gss340. the cars heading to the dyno tune but i cant even get the thing to start. it cranks and sound good but wont fire and very quickly floods itself out. ive backed down the regulator, check all my vacume hoses etc.. anyone have a similar experience with this or good ideas?
 

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#2
42 lb injectors are notorious for start issues.

It would be best to either trailor the car to the tune shop or swap out the maf and injectors to a smaller set.. drive carefuly to the dyno shop.. and then swap back out for your tun.

alternatively.. the PMS systems has a built in 42lb injector deal that solves the starting issues.
 
#3
When I first picked up my stang recently from the local German shop who did the head, cam, intake etc...with the vortech and 42lbs injectors...it would start, but would keep dying....on the drive home it would die when I downshifted at lower speeds...After a couple of days the problem corrected itself, maybe the computer needed to relearn???

Now the only problem I have is a surging idle when I first start the car, it probably last less than 5 minutes and sometime dies while surging, I have to push the gas pedal to the floor to restart it....but once the car is warmed up its fine.

I'll be back in the States in June and the first place I'm going is to get a tune on both my stangs
 
#4
42s are some big boys. You don't have heads listed in your signature, are they stock? If so, then you are overshooting w/your injectors by quite a bit! I had an underdriven (~10lb. boost, pretty comparable to the stock S-trim) A-trim on stock heads and the rest of the bolt-ons, and 30's were more than enough for it.
 
#5
poneypower89 said:
42 lb injectors are notorious for start issues.

It would be best to either trailor the car to the tune shop or swap out the maf and injectors to a smaller set.. drive carefuly to the dyno shop.. and then swap back out for your tun.

alternatively.. the PMS systems has a built in 42lb injector deal that solves the starting issues.
Click to expand...

... not to mention that the Lightning Mass Air Meter transfer function has almost ZERO in common with the transfer function of a Fox meter.

About the only similarity between the two are the initial voltage input reference. Even the output voltage between the two is different with the motor off and no air running though the meter.
 
#6
when I did the LMAF ans 42lb inj. on my car I was able to get it to start and run well enough to drive it to the tuner. I backed the FPR down as far as it would go and once moving the car drove well at 2000-2500 rpms , but would not idle for crap until the tuner burnt the chip for it. I drove it about 40miles on the highway and it drove like normal, but as soon as I got into stop and go traffic I had to keep blipping the throttle so the car wouldnt shut off. Good luck.
 
#7
well i see some of you have had it at least fire off with driveablity issues, wich is expected. and monsoon, i see you say that 42's are overkill but it seems that there are many numerous guys on this site and others that run damn near the same set up i am going for and swear by it. my tunner says that it should fire with what i have and ive called other shops that have said it should, and some say no way until it get pluged in or whatever. either way i dont care because its destiny is to go to the dyno and say, here, make her perfect. im more or less trying to narrow down faulty parts or whatever. at any rate is this something that the tunner will just work his magic on. im about to the end of my rope.
 
#8
I'm not saying 42s won't work (anything will work with a tune), but for your current setup right now, you can get away with 36s. That's 42# less fuel total, six pounds per injector. That's a hell of a lot. Like I said, I had a similar setup and the main man from SCT himself tuned my car back in '03 and it was safe. Once I added more parts I had to jump up to 42 pounders, but ALL I am saying is that you can get away with smaller squirters and it'd more than likely idle and drive for you much easier.

But you're wondering why you are having terrible idle problems, and that is your main reason. Too much fuel combined w/the new MAF and the computer doesn't know what to do with it all.
 
#11
What you might try doing is disconnecting the meter and seeing if the car will at least idle in limp mode. Just keep adjusting the AFPR down until it starts.
 
#13
mansonozz said:
I'm not saying 42s won't work (anything will work with a tune), but for your current setup right now, you can get away with 36s. That's 42# less fuel total, six pounds per injector. That's a hell of a lot. Like I said, I had a similar setup and the main man from SCT himself tuned my car back in '03 and it was safe. Once I added more parts I had to jump up to 42 pounders, but ALL I am saying is that you can get away with smaller squirters and it'd more than likely idle and drive for you much easier.

But you're wondering why you are having terrible idle problems, and that is your main reason. Too much fuel combined w/the new MAF and the computer doesn't know what to do with it all.
Click to expand...

i follow what your saying. my problem is the car will not start at all.. so are you guys saying that i have to much injectors for the car to start? i know every car is different but it seems even guys here have at least had their cars start and run.
 
#14
yea, the same thing happened to me and i had larger heads too. It would only start when i gave it a lot of air (hit the gas) and then it'd die out soon after because the fuel was too much
 
#16
blownlxvert said:
i follow what your saying. my problem is the car will not start at all.. so are you guys saying that i have to much injectors for the car to start? i know every car is different but it seems even guys here have at least had their cars start and run.
Click to expand...

It sounds like you have flooded it to the point of fouling the sparkplugs. If they are fouled, even the correct injectors and maf wont help you start it. Take the plugs out and check to see if they are pitch black. If so you'll either have to replace them or clean the living **** out of them. Just spraying them with cleaner wont do, you'll have to use something along the line of fine grit sandpaper.
 
#17
millhouse said:
It sounds like you have flooded it to the point of fouling the sparkplugs. If they are fouled, even the correct injectors and maf wont help you start it. Take the plugs out and check to see if they are pitch black. If so you'll either have to replace them or clean the living **** out of them. Just spraying them with cleaner wont do, you'll have to use something along the line of fine grit sandpaper.
Click to expand...

YUP!
 
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