OK so i just installed a miniram and it's back firing threw the intake! At full thol. Iv tho it was a timing problem, iv set the base timing from +6 to -2 but nothing changes. Can it be crank case vapors threw the PCA value setting it off to back fire??? Im not sure what to check next! help plz

JAMES

 

The distributor could be 180 out.

 

no way and still run!

 

Plug wires in the right place/order? that's an easy look see.... Are they arcing across to ground?

Geez............ what else?
Are you going lean at full throttle?

Good luck

 

pulg wires are all in the right place and not arcing. i know it easy to over look but the car runs great just in till you punch it and iv been check the fuel pressure and it does not move off of 45 psi at all. I think that if it was a timing thing than it be back firing out the exhaust not the intake right?

 

You are too lean on acceleration enrichment, you need the chip reprogrammed from more acceleration enrichment (Pump shot).

 

so the stock ecm just can keep up with the miniram intake? but y the back firing therw the intake? thanks i will look in to it!

 

yep sounds liek a tune is in order. miniram is known to backfire because so called factory pump shot is not enough for that air flow from the new manifold

 

thanks guys! I will look in to a dyno tune very soon! just sounds weird that it will back fire threw the intake.

 

An engine won't run with a distributor 180 out, it would be firing the plug on the exhaust stroke.

Lean Air/fuel can cause a backfire and I suspect is the situation here.

 

I don't think that the average dyno tune will help.... I think that you gotta datalog that car and re-burn a chip which will mean finding a replacement prom and reburn it with the right specifications.....
Maybe your shops can do that ...... mine don't

I gotta get into the prom thing too!!!!

 

Moates.net has everything you need. Burning proms is old school, now days we use prom emulation. With this equipment you can run/log, review, edit, save and do it again all from the drivers seat. I have my son ride shotgun, he reviews the log, we discuss the edit, he makes the change and we run again. If you are going to mod an EFI vehicle you should first be able to tune it to take advantage of your mods.

 

If it backfires through the intake, that means it is firing on the intake stroke, because the only way for it to go back through the intake is if the intake valve is open, so your timing is advanced way too much, but don't listen to me, i'm no auto mechanic, only studying to be one lol

 

I tho that a dyno will do a data log on my car and re-burn a chip for my mods. Tho that's what a dyno was.? and I check the timing like 20 times, i did it over and over, iv set the base timing from 8 all the way down to -2 and it just seems to backfire threw the intake more at a lower base timing. iv been driving it and was not back firing threw the intake if there was A load not ever time tho and if there is a load it will backfire out the exhaust when I'm slowing down from wot.

I check out Moates.net TexasSilhouette and its got some good stuff. should i just buy the data logger and save my money by not getting the dyno. and just see how the data logger works for my car. thanks for the web site!

 

I don't know about your area, but the dyno's around here don't datalog OBD1 cars.......... OBDII cars are easier to work with and our cars are 20 + years old. They don't bother with 3rd gens when there are a ton of 4th Gens that are easier to tune....

I must say though that the datalogger and emulation looks very interesting and I wanna/need to get into that. Just need more time and $$$$$$$

 

http://www.moates.net/product_info.p...products_id=33

http://www.moates.net/product_info.p...roducts_id=127

http://www.moates.net/product_info.p...products_id=66

This look good to anyone? and what else will i need?

 

What will you do once you have logged the data? How will you make any changes? http://www.moates.net/product_info.p...products_id=33 is worthless without a custom prom.

All in one package
http://www.moates.net/product_info.p...products_id=54

 

Thats less an a dyno tune if i buy this is it going to help more than something i can get from a dyno tune? and do you think it will help my problem. im not really sure what i will be changing in the prom, fuel/air

 

Your comparing the cost of one tune to your ability to tune infinintly, if you spend $300 having somebody else tune it, what will you do when you make your next mod? What will you have learned?

Anybody can pay somebody to build them a car, not that there is anything wrong with that.

It's your money, I can only illuminate the path you have to choose.

I won't kid you, tuning is not something you learn over night.

 

OK i see your point and your right about the tuning and money part. i know the you cant just learn it over night but i just don't know the software side like what too buy, but i see what i can get now. thanks. it looks like its just plug and play. you log it and rewrite it, and see it in runs better or not.

 

A more cost effective solution is:
http://www.moates.net/product_info.p...roducts_id=169
http://www.moates.net/product_info.p...roducts_id=127
http://www.moates.net/product_info.p...products_id=41

 

i got no problem spending the money on the everything in one pack. i will just have to play with it to find what works better for my car for your help

 

Great info here TEXAS!!!!!!!!

(I've been keeping my eye on this post) I'm gonna have to do some tuning now that my build is finished

 

you can download a copy of TunerPro and load a stock aujp bin (data from the prom) and poke around in it a bit. Craig's file library has stock and modified bins available for download. There has been a lot of effort put into the "Super" AUJP bins that have all the little stuff done for you and are essentially ready for you to start tinkering with fuel and timing to get your ride rolling. READ THE DOCUMENTATION!

You can load a stock and super bin in TunerPro and compare the two and see exactly what was changed. Play with the software and the bins (you will need the correct definition file so TunerPro knows how to decipher the BINs). familiarize yourself, research answers to your questions, get comfortable, and make sure it's something you want to do before you spend a penny.

Realize however, no amount of tuning can correct a basic malfunction (fuel pressure, base timing etc.). You have to make sure everything is as it should before tuning.
To reap the benefit of any performance mod, you must modify the code accordingly. Else the computer runs the car as if it were equipped with stock hardware.

Consider too (more $$) a wideband O2 sensor. You can add it's output to the data collected from the APU1
This is an example of data log I made during an N2O pass. The actual AF Ratio is included in the log. You can see this one is a bit lean but looking over at the knock count the computer is keeping detonation well in check by taking just a few degrees of timing out. Using this data I can choose to add more fuel under these conditions and/or take some timing out.


Enjoy.