3rd Gen Jeremy

I'm at my wits end with this thing. I can't get my car to run once it gets warm. I just installed a new secondary fuel rail with 1600 cc injectors and moved my primaries up to 850s. I was told that I had to upgrade my ECU so I got an Apexi PFC. I got everything in but it won't run right.

It starts once it's cooled down but doesn't run great. I try to do the idle learn test but once I reach ten minutes, I turn on the defroster and it runs REALLY lumpy and then dies. There's some alarm or buzzer coming from the engine bay and the exhaust overheat light is on. Somebody please explain the buzzer to me because I've never heard it before.

I've got the injectors set at 850 and 1600 but it's still not working. It's like it starts to learn the right idle then it quits. Just when it starts to run better and get a better AFR that's when it quits running altogher.

Before the fuel system upgrade, it worked great, now it's a dog!

Please show me the way!!

GregFD3S

once its warm? what is your water temp correction set at? +80C should be at 1.00, or somewhere close.

3rd Gen Jeremy

It's set at whatever the base map set it at. I'll check though.

Stix37867

iTrader: (1)

Bingo!!!

That's why it won't run right. The base map doesn't support bigger injectors. I see you're getting it tunned by steve this weekend. He'll set it up right.

GregFD3S

no, your water temp correction allows correction for fuel according to various water temperatures. it is not on your base map.

settings > wtr temp

the correction value is next to its corresponding water temperature. the value in the left column is your "low load" setting, and the value in the right column is your "high load" setting. both should be 1.00 at +80C water temperature.

Default settings:
+80C - 1.00 - 1.00
+50C - 1.07 - 1.01
+30C - 1.29 - 1.21
+10C - 1.57 - 1.50
- 10C - 2.01 - 1.87
- 30C - 2.81 - 2.57

GregFD3S

you diddnt get it tuned after you installed the injectors? theres your problem...

GregFD3S

Did you change your injector pulse/lag time after you installed the new injectors?

3rd Gen Jeremy

No, I thought that it would run with the injectors but run crappy. It won't even start at all anymore.

Steve can fix that? I was contemplating not even going now because I can't start the car. That won't be a problem?

Jeremy

Stix37867

iTrader: (1)

It's not starting because it's flooded. The new injectors are adding too much extra fuel. That all gets taken care of when it gets tuned. How are you getting it down there?

3rd Gen Jeremy

I'm trailering it up there. I'm actually coming from Memphis. I wasn't sure if he would do it if it wouldn't start.

By the way, I did change my injector size in the commander to 850 and 1600 which is what I'm running.

GregFD3S

you should check your injector pulse on your Power FC. chances are that you diddnt change them when you upgraded your injectors.

settings > injector

the formula to finding your injector pulse correction value is old/current=pulse correction value

Primaries:
550 divided by 850 = 0.647 (64.7%)

Secondaries:
850 divided by 1300 = 0.653 (65.3%)

You also have to adjust the injector lag time, which is as simple as subtracting the old time from the new time. (eg 75ms - 72ms = 3ms)

this will hopefully get your car running, but you still need to get your map retuned

3rd Gen Jeremy

What are the injector lag times for the Bosch 160 lb injectors?

rynberg

All this info is in the PFC forum.....you need to learn about how to do these things BEFORE you do them, is all I have to say. MOVING to PFC forum.....

cewrx7r1

iTrader: (2)

This is an example of how not to do any mods on any car!
When will these people learn to think?

And if you say, well Chuck you went through this stage also.

I wasn't like this not even as a teenager because: I was already building and flying model airplanes; building radios; experimenting with chemistry; working on my parents car, etc.

All that my dad gave me was carpentry, fishing, and hunting skills; and most importantly - "discipline" as he was a Marine career officer.

When I wanted to do something new, I read what ever info was available about the subject first. This was before the internet when information was harder to find. No excuse for these youths of today!

3rd Gen Jeremy

Thanks guys. No need to be so harsh. I know that I shouldn't have done it this way but I had to make a deadline to get Steve Kan to tune it. I'm starting Grad School and a new job as well as running my own business so I can't stretch the project out for as long as it would take.

Turns out I flooded the engine. I dried the plugs and cranked the juice out of the engine. Steve changed the injector duty to 68% for primary and secondary and set the lag to -.04 and it cranked right up.

I did do research but some things you just have to learn the hard way. The important part was that I got everything installed correctly and the tuning was going to be done by Steve. It worked out great so I guess I'm not as much of an idiot as you guys make me out to be.

Thanks again,
Jeremy

GregFD3S

i wasnt saying you were an idiot. you just have to adjust things when you get bigger injectors.

im glad you got it fixed, steve is a pimp.

3rd Gen Jeremy

Not you 1.3 liter, you've been a big help and you were right on. That's almost exactly what Steve set as a base map to start the car. I was actually referring to cewrx7r1 's comments about learning to think. I'm actually a pretty smart guy but ran into some problems the day before the tune and needed some help.

My problem was of more of logistical nature. I didn't get the PFC on time and I bought it a month and a half ago so I had to get my primary rail milled for the fuel kit I wanted to run at the tune so I could have it back on time. Once that was done, I couldn't run my stock injectors anymore so I had to put my PFC and injectors in at the same time. That's how I ran into problems, not because I don't think, trust me, I put a lot of thought into this whole build. Despite a few hiccups, I feel that I did a damn good job and didn't deserve the criticism that I received earlier in this thread.

For those of you who wanted to help and not just sound off and feel superior, I really appreciate all the help you guys have given me. This forum is great for those who want to know all there is to know about our cars. Everybody is really helpful and I can't say enough about everybody at the St. Louis tune who helped me not only sort out my issue but actually turned wrenches along side me. It was a great experience.

Thanks again guys,
Jeremy