hey guys i really need some help. I swapped a L98 from a 91 corvette into my pontiac fiero. car runs but it runs extremely rich. now i have been having one hell of a time with the mem-cal computer chip prom whatever its called. I Was havin a hard time with the vats system at first and i called pcm for less. they made me a chip that piggybacks onto my mem-cal. now the vats is turned of and is letting my car run now. but its running extremly rich. like to the point where its fouling all my plugs. and when i pull them they are black and wet. now is this because the memcal in my car is from a automatic and i am running a manual trans?? a buddy of mine told me this was more then likly the problem. what do you guys think?? any help you be great. or ideas on what might be wrong. i am just sort of guessing here

thanks
Scott

 

Stock engine? I would think tranny makes no diff but needs to be addressed in the .bin eventually as car will die during rapid deacceleration to stop I believe. I would confirm you are running closed loop(02 sensor functional) and check the coolant sensor(tells ECU car cold coolant if defect). Do you get a CE.SES blink when ign turns on? Could it be running in limp mode?

 

what is a CE.SES blink??? my o2 sensor is new and i am pretty sure my cold temp sensor is good. I just found out today after looking at them i have freaking 30lb injectors in my car. that seems like a little much.

 

I`d really like to see some pics of that.Thats sounds crazy.How did it fit?

 

yeah i guess the best way to disgribe how it fits is barely :P. the water pump pully actually goes into the wheel well just to give you an idea. But really being as it has no smog crap and no ac it seems easier to get to things then on my old motor. like i just pulled out all the spark plugs and cleaned them off as they where all fouled and covered in fuel. i am guessing from these stupid 30lb injectors. who in the hell runs 30lb injectors on there 350?? and what mods have to be done. I mean is it possable for me to use these things or am i going to have to drop a couple hundered on some 22lb injectors to get my car running good???

 

I was so interested after I posted that other post I went on the fiero forum and searched and found a bunch of pics.I guess there was a little more room than I thought in the car but it still looks like a pretty tough swap.
For your question If the engine is basicly stock other than the injectors they are deffinatly overkill.If it`s midly modified 24`s would be good or even the stock 22`s would be fine.Regardless the chip needs to be tuned for whatever injectors you have.You can get a good set of injectoers from FIC Fuel injector connection I think it is for around 165-185 bucks.It would be worth it.Proper tune and all that thing would be a beast.If it`s stock I`d go stock injectord and chip if you`re not wanting to start doing your own tuning,or get it dyno tuned.Everybody says a mail order tune will never be right.
Some pics I saw on the fiero forum were of a hotcammed 383 fastburn 425.How much do those cars weigh.One is for sale around the corner from me.Needs paint but it runs.They look like fun cars.I always loved them when I was a kid,but they stopped making them a couple years before I got my license.Kinda forgot about them cause you rarely see them around here.

 

When you turn ign on but not crank the check engine/service engine soon light should flash on-off and then on steady. I believe that is some sort of diagnoistic check to verify the ECU and or chip/.bin is working. Occasionally for reasons I dont understand when I flash in a new .bin I do not get a successful blink. Then I reflash and all is well. If it does not do that routine then i believe it defaults to limp home mode and runs car off that chip. Since my engine is mod it runs like crap on limp mode.

 

i am at work right now so i can not go verify that the check engine light is blinking like it should. but i am fairly sure it is blinking as you have discribed. plus when i do rev up the motor it sounds great. which i know nothing about limp home mode but it does not seem like thats my issue. i am pretty sure from what i have read that these 30lb injectors have got to go. from what i read it seems that 30lb injectors on a stock motor would cause it to run extremly rich. am i wrong???

 

I think another option would be to tune with car with the 30lbs injectors.
Don't you need to remove the motor to change injectors... I know its tight in there....

 

You dont think those 30#ers are too big for a stock l98?

 

haha no i am pretty sure they are to big. i was just wanting to confirm the fact that they are whats making my fiero run so rich. and i figured it was a long shot but i was hoping maybe by turning down my fuel pressure or something like that i could make these injectors work. but i assume that i will have to just bite the bullet and get some new injectors. should i go with the 22lb ??? and where can i get a good price??

thanks guys for all your help

 

I had a similar problem with my camaro with a new motor and rebuilt carb. It was running way rich for no reason (seemingly) I had all new sensors and everything. Turned out my coolant temp sensor was bad and was telling the computer the car was -20 degrees causing a rich condition. you can check this with a voltmeter easily to make sure it is not the problem.

 

First thing I`d do is find out for sure what the problem is.The injectors are a problem I`m sure but as stated there may be other things.If you have a laptop get an aldl cable or a scan tool and see whats going on.I think I said in an earlier post check out FIC Fuel injector connection.They have a good rep.and good prices with a warrenty.Is the motor stock?

 

The problem is most likely from the chip not being set for the correct injector size.

The factory chip is set to open a 22lb injector for x amount of time to get the required fuel. Now you have a 30lb injector in there that is still being told to be open the same amount of time as a 22lb injector thus injecting wayyy too much fuel.

Get the chip redone with a 30lb injector constant and everything should be fine. The ecm can componsate a little bit like running a 24lb injector on the factory bin but having that big of a difference in injector size it can't.

You could run 60lb injectors in a stock engine and if tuned properly it should run fine.

 

Not completely true. Bigger injectors have more "mass" to move around and therefore take longer to open and close. That, plus the very very small pulsewidth needed to deliver enough fuel would mean the motor wouldnt run under about 2500 RPM.

 

I would think if it was no big deal as long as the tune was set for 30 # injectors evertbody would be running 30 # injectores or they wouldnt make so many differant flow ratings.I`m sure you can get the tune really close,just seems to me it might be easier to tune with something more along the lines of the setup he has.I may be wrong but I wouldnt put 30 #ers on my setup regardless of wheather it could be tuned to run well.

 

just from all i have been reading and from what you guys have told me i really do need to just get some 22# injectors. but just for piece of mind i would like to check my coolent temp switch. how do i go about doing that?? you said i use a voltmeter. what wires do i hook to and what should be my voltage range?

 

you want to use the resistance settings. Somewhere around here is a table o temperature vrs. resistance values.

 

Have you tried this? I have. Pretty sure my engine runs under 2500rpm. It works. I get 24-26mpg on the highway too. My injectors are racetronix seimens/deka 63pph flowmacthed.

How do you think People run big injectors on stock boosted engines? keep the rpm over 2500?

 

What about ease of tuning.Di you think it would be easier to tune the prom for the bigger injectors or just swap in some stockers if thats what the tune is set for.I`m no tuner so I dont know.What do you think would be easiest for this guy?

 

well just from what i am reading and that fact that i have no tuning experiance. i am thinking the 200 dollars for the right size injectors is going to be the way to go. i talked to the guy at fuel injector connection today and he was super helpful in getting me the right injectors. i ordered some 22lb boush III style injectors. i mean i just figured with a bunch of great tuning and lots of cash i could make these injectors work. but why go through all that hassle when changing out some injectors cant be that hard.

 

Did you check out the cts?I had a bad one,made my car run rich.If it is bad and you do swap it make sure you disconnect the battery for awhile to erase the stored code.

 

yeah i did check the CTS switch and it appears to be working normally.

 

yes I have. If you have injectors much too big for your engine/combo, you will have trouble tuning the idle. If you don't believe me ask on the DIY prom board.