Guys i need help asap please !!!!

**rcorte3001** · 05-29-2010, 03:00 PM

Ok so heres the problem i have a 98 firebird formula A4
with-----
40,000 miles
Headers
slp intake,
ORY
Magnaflow
Frost Tune

and i realized the other day that it was running kinda choppy then my light came on code P307 and the car smelled EXTREMLY rich! it was misfireing in cylinder 7 so i changed the coil pack the wire, the plug still ran like shit especially when i was sitting at a light it felt as if it was stutering
so im pretty sure its the fuel injector its staying open and just dumping into the cylinder!

what fuel injectors should i get? i only want to replace the one with a stock 28 lb injector, and autozone has a single Bosch for 129.99 or what size injector can i upgrade to without changing the fuel pump? what do you guys think?

also any write ups on how to take off the fuel rails and replace fuel injectors?

any help would be appreciated

thanks guys
i can always count on ls1.com!!!!!!

**lancesT/A** · 05-29-2010, 03:21 PM

you can upgrade quite a bit without changing your fuel pump anything around 60lbs or higher is where u start to look at changing the pump if your planning on running more mods (cam, heads, etc) you might as well spend 330 on a set of racetronix 42lbs or whichever brand you choose all around the same price. better than spending 130 on just one (stock replacement) injector

my .02

**rcorte3001** · 05-29-2010, 03:41 PM

Well I don't think I'll be putting in a cam or heads the only other work that will be possible going into the car is ls6 intake manifold, gears and rear end work what's the best size injectors to put in with my current mods and would I need to send it back out for another tune? If so where can I get a good set of stock injectors for a good price?

**lancesT/A** · 05-29-2010, 04:08 PM

price wise for a full set of 37lbs injectors from texas speed for 280 which i dont think u will require a tune it might be beneficial to get one however

**lancesT/A** · 05-29-2010, 04:11 PM

for stock ones they have them for 40 each on rockauto.com but that is for a reman injector but it beats 130 for a bosch

**DaddySS** · 05-29-2010, 05:51 PM

When you pulled the plug was black & sooty or black and shiney?

**rcorte3001** · 05-29-2010, 09:05 PM

Originally Posted by DaddySS

When you pulled the plug was black & sooty or black and shiney?

To be honest I'm not sure I didn't pull them and replace them my buddy did while I bought some parts I'll Check first thing tommorow, but why what does it mean for either condition?

**tatertot91** · 05-29-2010, 10:57 PM

did you try cleaning your MAF, its worth a shot
CRC maf cleaner works good

**02blkws6** · 05-29-2010, 11:46 PM

Originally Posted by lancesT/A

price wise for a full set of 37lbs injectors from texas speed for 280 which i dont think u will require a tune it might be beneficial to get one however

Larger injectors require tuning or you'll wash the cylinders. I can't believe some of the bad info I read on here and LS1Tech.

**lancesT/A** · 05-30-2010, 12:31 AM

Originally Posted by 02blkws6

Larger injectors require tuning or you'll wash the cylinders. I can't believe some of the bad info I read on here and LS1Tech.

i dont think a 28 to 37 jump will wash the cylinder but i guess il leave it be dnt wanna start an arguement especially over the internet

**02blkws6** · 05-30-2010, 04:49 AM

Originally Posted by lancesT/A

i dont think a 28 to 37 jump will wash the cylinder but i guess il leave it be dnt wanna start an arguement especially over the internet

Going from a 28 to a 37 without a tune WILL wash the cylinders. If you don't believe me, try it on your car. What is there to argue about? You don't even know how to tune cars. You have a built 408 in your car? What's it run at the track?

**rcorte3001** · 05-30-2010, 08:46 AM

Ok so ordered a remanufactured fuel injector from rockauto do i need new rings and seals for the injectors since i will be taking out the fuel rail on the right side do i need rings and seals for the fuel injectors that are coming out? im just changing one out but wondering if i will need them all for the fuel rail?

**lancesT/A** · 05-30-2010, 10:43 AM

Originally Posted by 02blkws6

Going from a 28 to a 37 without a tune WILL wash the cylinders. If you don't believe me, try it on your car. What is there to argue about? You don't even know how to tune cars. You have a built 408 in your car? What's it run at the track?

no track times yet need to upgrade the rear end first just finished the 408 project 2 weeks ago and ur right i dont know how to do the tuning part

**lancesT/A** · 05-30-2010, 10:46 AM

Originally Posted by rcorte3001

Ok so ordered a remanufactured fuel injector from rockauto do i need new rings and seals for the injectors since i will be taking out the fuel rail on the right side do i need rings and seals for the fuel injectors that are coming out? im just changing one out but wondering if i will need them all for the fuel rail?

i would replace them but thats bc i dont like to reuse anything but when u get them out u can always visually inspect them to look for any extensive wear or damage and go from there

**Cutlass** · 05-30-2010, 12:49 PM

rcorte3001 if you just have a bad injector and wanna replace it, then just look for a used stock replacement. try junkyard or check the For Sale section for someone selling theirs because they upgraded

**02blkws6** · 05-30-2010, 03:53 PM

No need to replace all the injector o-rings. Smear a little clean motor oil on the o-rings to make assembly easy.

lance, I'm still on a 10 bolt.

**lancesT/A** · 05-30-2010, 03:57 PM

Originally Posted by 02blkws6

No need to replace all the injector o-rings. Smear a little clean motor oil on the o-rings to make assembly easy.

lance, I'm still on a 10 bolt.

nice

i dont have problem with the 10 bolt i ordered my moser axles friday.... im actually really nervous about going to the track dont wanna break anything the 408 build was expensive and i dont wanna break anything but there is an 1/8 mile track in my town so im sure il be up there nxt weekend

**squirlnutz** · 05-30-2010, 05:08 PM

Originally Posted by Cutlass

rcorte3001 if you just have a bad injector and wanna replace it, then just look for a used stock replacement. try junkyard or check the For Sale section for someone selling theirs because they upgraded

your best advise. Better listen.

**Marc 85Z28** · 05-31-2010, 04:46 AM

The injector may not fix the misfire.

A compression test should be performed first.

**rcorte3001** · 05-31-2010, 06:37 AM

Originally Posted by Marc 85Z28

The injector may not fix the misfire.

A compression test should be performed first.

What else would it be we have done spark plug wires coil packs and the only other thing is fuel injector

Keeping in mind it only has 40,000 miles and it smells extremly rich

I haven't done a compression test yet what should it be at 4ohms