2G 2g p0170 code and temp gauge rising

[Boosted2gdsm]

Hello this is the first time posting on here, so please excuse any "noobish" questions.

I'm having some problems and hoping someone could help out.

I have a 99 eclipse gst convertible, I'm currently having a code p0170 which is bank 1 fuel trim.
Well this code came on after I installed my after marketfuel pressure regulator (I'm gussing) because after installing the pressure regulator I noticed that my timing belt had been ripped off half way ( thank god it didn't snap) after I got the timing belt replaced along with belt , and everything that needed to be replaced , I noticed my check engine light came on after 40 miles of driving . Now I changed the upper oxygen sensorbut the code still came back on after resetting it.
My vacuum is good. When I'm at boost 15 psi it stays 15 psi , it doesn't creep or loose any boost.

MODS:
:255hp walbro pump , not yet rewired
:20g bastered turbo ( 20g compressor in 16g housing)
:full big front mount intercooler
:3 inch maf with Maft
:450 cc injectors
:after market fuel pressure regulator
:maft is blowthrough not recirc , no filter on turbo.
:boost gauge

I do not have a tunner nor a air to fuel gauge as of now.

Also is it normal for my fuel pressure regulator to drop to like 33 psi after I set the psi to 43 with the vacuum hoseoff and blocked ?

Thank you

 

[dustyboner]

you have a 1:1 boost reference FPR, right?

Also is it normal for my fuel pressure regulator to drop to like 33 psi after I set the psi to 43 with the vacuum hoseoff and blocked ?

yes. whatever the static fuel pressure set at , it will be less with vacuum and should rise 1psi for every 1psi of boost

 

[Boosted2gdsm]

you have a 1:1 boost reference FPR, right?

Also is it normal for my fuel pressure regulator to drop to like 33 psi after I set the psi to 43 with the vacuum hoseoff and
blocked ?

yes. whatever the static fuel pressure set at , it will be less with vacuum and should rise
1psi for every 1psi of boost

I have this one , the code p0170 came on after fuel pressure regulator install. I also notice that when I get on boost my temp gauge goes up 3/4 of the way but then goes back down. I changed the thermostat, but should I change the coolant temp sensor ? Alot of people are saying that code p0170 can be from that ?
My car drives fine . It's just the code pissing me off..
http://m.ebay.com/itm/Adjustable-Fu...ne-BLUE-RED-/191084434539?txnId=1244081434009

 

[dustyboner]

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FUEL PRESSURE

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[Boosted2gdsm]

Yes well I know about that, I've done so much reading that my head is about to explode ...

My question really is, would my after market fuel pressure regulator be the problem ? Should I try to adjust it to 43 psi while the vacuum line is hooked on instead of adjusting it with vacuum hose off ? Maybe more fuel will fix the lean problem ?
Or can I adjust my maft to 550 cc instead of what I really have 450 cc. Thanks for the help I appreciate it. And sorry if my questions sound stupid

 

[dustyboner]

your fuel pressue is right on, 33psi with the vac line connected at idle (engine warmed up), 42-45 with the line disconnected/ blocked.

i would check the MAF first.


do you have or have access to an ODB2 scanner that will give you a basic datalog? you need to check and see what values the ECM is showing for intake air temp and coolant temp. you also need to see if your fuel trim is (-) or (+).

 

[Boosted2gdsm]

I do have a scanner and I will check first thing tomorrow morning ,
Could you please tell me where my intake air temp and coolant temp is supposed to be ? And is my fuel trim supposed to be + or - ? If so then what is normal supposed to be. Thank you

And I did mention that I have a 3 inch gm maf . And it was tested and works great . The code p0170 problem came after I installed the fuel pressure regulator and after I got the car from the shop , they did my water pump and timing belt and all the components that affiliated with those 2.

But the car ran great with no codes before when I had stock fuel pressure regulator.
The car still drives and runs great but the p0170 code is annoying to have . I never had it before I installed the after market fuel pressure regulator.

Thank you for your feed back and quick reply

 

[Boost-Junkie]

What are your o2 readings showing on your scanner? it's on a 0-1v scale at operating temp your looking for. As far as fuel trims you need to have the car warmed up operating temperature and you want to have +10 to 0 or 0 to -10 that's the threshold any more than that + or - is an issue.

 

[Boosted2gdsm]

What are your o2 readings showing on your scanner? it's on a 0-1v scale at operating temp your looking for. As far as fuel trims you need to have the car warmed up operating temperature and you want to have +10 to 0 or 0 to -10 that's the threshold any more than that + or - is an issue.

On my scanner the o2 reading go from 0.100 to 0.800 , they jump constantly as I drive . Is it normal ?

I still have an issue with the code p0170 ,
I have not yet found out what the problem is. The car drives fine , but this code is annoying . If you know please let me know .thank you for the help

 

[Boost-Junkie]

what do your fuel trims read at idle warmed up and at a constant cruise? Is the vehicle still overheating? Or is it just the code bothering you now

 

[Diamond Star Werks]

You need to do a smoke or boost leak test and make sure you don't have any leaks before or after the throttle body. Check your fuel trims negative means too much fuel and positive means too little (intake leak.) They need to be less then 8% either way.

 

[Boosted2gdsm]

what do your fuel trims read at idle warmed up and at a constant cruise? Is the vehicle still overheating? Or is it just the code bothering you now

Fuel pressure at idle reads 33 psi , but it's set at 43 with vaccum line off and plugged . I've read it's normal to drop at idle like 10 psi ? If I'm correct ?

And as far as over heating , it doesn't over heat but when I boost , temp goes to 220°F extreme psi , one of the guys told me to get a dual core aluminum radiator since I have a big front mount , so I ordered that and now I'm waiting , hopefully it helps.

And yes the code still comes on , idk why , still a pain in the ass the look at . I don't know what the problem is. I just don't want to throw money at it and not being the problem like I did with changing the oxygen sensor upstream

 

[Boost-Junkie]

It's a p0170 so I don't believe it's running rich or lean especially since it's running fine. I still want to know fuel trims if you can read them on your scanner at operating temperature. If there was a restriction Bc of your front mount you would overheat at idle or low speeds. Under boost there would be more flow across the front end so that shouldn't drive temps up

 

[Boosted2gdsm]

It's a p0170 so I don't believe it's running rich or lean especially since it's running fine. I still want to know fuel trims if you can read them on your scanner at operating temperature. If there was a restriction Bc of your front mount

you would overheat at idle or low speeds. Under boost there would be more flow across the front end so that shouldn't drive
temps up

SO what do I look for in my obd2 reader? I'm not really sure what to look for ? Like it says fuelsystem1 says "cl"
And fuelsystem2 says " --? "

Any idea ?
And for the car it doesn't over heat though , temp goes up but it goes back down after a few seconds of driving normal . Idk I will see what the new radiator does.

But please help out with the code p0170 before I go crazy ..

 

[Boost-Junkie]

Cl means your in closed loop function meaning your o2 sensor determines fuel calculations. In open loop (cold motor) the computer results to stored data to adjust fuel timing spark etc based on its environment ect map etc

 

[Boost-Junkie]

Look for long term fuel trim, short term fuel trim. Lgft shft etc

 

[Boosted2gdsm]

Look for long term fuel trim, short term fuel trim. Lgft shft etc

OK so short is 0.8%
And long is 12.5 %

How do I post a picture on here ?
When I try it says picture to large ?
Or you got an email maybe you could help me since you know alot more about this.
Thank you

 

[Boost-Junkie]

Maybe another member can help with that I'm not to savvy with that function yet. But what your fuel trims read is that I'm adding a lot of fuel so to correct I'm going to add fuel definitely (long term) and then I'm going to fine tune with short fuel trim. That's why short is single digit while long is double digit . Not normal!

 

[Boost-Junkie]

It's adding fuel in the long run basically, but it sets the code because I believe you've exceeded normal fuel trim values (long term)

 

[Boosted2gdsm]

Maybe another member can help with that I'm not to savvy with that function yet. But what your fuel trims read is that I'm adding a lot of fuel so to correct I'm going to add fuel definitely (long term) and then I'm going to fine tune with short fuel trim. That's why short is single digit while long is double digit . Not normal!

Wait so what's going on ? I'm lost .
Is it running rich ?
What are the numbers supposed to be so I know how to fix it ?
Like what is short supposed to be at
And what's long ?
Sorry for all the questions , I still have trouble understanding it

 

[Boosted2gdsm]

It's adding fuel in the long run basically, but it sets the code because I believe you've exceeded normal fuel trim values (long term)

OK so how do I go by fixing this problem ? What can I do ? I was thinking about slapping the stock fpr and drive it for 100 miles and see if it comes on . What you think?

 

[Boost-Junkie]

Try installing your old one so you don't waste money. If the code goes away post results including fuel trims that will help evaluate and explain everything simpler

 

[Boosted2gdsm]

Try installing your old one so you don't waste money. If the code goes away post results including fuel trims that will help evaluate and explain everything simpler

Okay that sounds about the best way to go , because like I said the code popped on after I installed after market fpr ..

Any ideas on what the fuel trim is supposed to be at ?

 

[Boost-Junkie]

And to clarify computers read how much oxygen is in the tailpipe if you have a lot of oxygen it's going to add fuel to adjust and if it reads very little oxygen it will pull fuel because there is too much fuel. That's what fuel trims are - pulling fuel or + adding fuel that's a brief overview

 

[Boost-Junkie]

In short and long term fuel trims you want to see under double digits. -10 or +10 but in cases it is normal to see just a hair over or under those