Hello. I have searched, but all the other threads included other codes, but no definitive fix related to me. I don't have a lit CEL on the dash but this is a stored code when i ran a diagnostic. I have a 2008 w/ about 165k miles.

Any insight would be appreciated. TIA

 

Try a fuel injector cleaner first and see if it goes away. If not, you could have a clogged or failed port injector not to be confused with the direct injectors responsible for the vast majority of engine operation parameters.

 

^^ Code says open or short detected in port injector. Fuel cleaner is not going to fix that. Sadly it does not resolve to which port. Recently a member on the 350 side had an injector fail. I had him measure the ohms of the suspect port injector and compare it to two others. The suspect one read 24 ohms higher than spec and the others.

I thought he'd be chasing a broken connector or wire but he replaced the whole set of injectors and all is well! Runs good with no CEL.

 

No, that's not what is in TIS.


There is nothing about an electrical issue with this code in TIS.

Fuel Trim (Port Injection, P1170)

DTCs of fuel system have already been set -

EVAP purge-cut Executing

Direct injection 100%

Both of the following conditions 1 and 2 are met:

1. Average between short-term fuel trim and long-term fuel trim

Less than 35% (varies with engine coolant temperature)

2. Average between short-term fuel trim and long-term fuel trim

More than -35% (varies with engine coolant temperature)


Agreed, it's certainly not helpful, but running a cleaner first just in case one injector is performing poorly is pretty cheap. Anything else is going to be pretty pricey depending on the skill level of the owner, and even if the owner is skilled, buying 8 new injectors won't be exactly chump change.

A dealer is going to swap out a whole host of things before they get to a wiring check - PVC, MAF, coolant temp sensor, O2 sensor(s)...

 

That "varies with coolant temp" in parentheses may be a factor as i do have the dreaded valley plate leak that the dealer gave me a ridiculous estimate, since they gouged me in wanting to replace knock sensors while they would be in there, raising the estimate from $1800 to around $4k.

I hate how most codes are thrown due to other things possibly going on.

I did try fuel injector cleaner and that has helped with KCLV that has been lacking for the longest time, so something at least was beneficial. Always hovered around 12-13, now around 19 and got it all the way up to 23.3.

Thanks for the input. The quest continues until i can afford to do the valley plate repair and see if that may help

 

Bumping this up - as I am having a similar issue.

Stored P1170 - but no cel. LT fuel trim is up to 29%.. I suspect I have an exhaust leak at the header/exhaust junction - could this be a contributing factor?

 

Yes, but an intake leak is more likely unless the leak is close to the wideband sensor in the header.

 

I reverted back to stock intake and removed the AOS and all was good again. There are a handful of cases where the RR intake just didn't work for some people, like me.

Do you have the RR intake or AOS?

 

Thanks for the info - I am on stock intake and no AOS. I do have a silicone intake elbow..

I will check all connections and vacuum lines.

 

I have the HPS silicone tube also on and no issues going back to that. The stock intake box has that known issue on the plastic outlet (past the MAF sensor) that connects to the elbow, kinks inward from over tightening over the plastic tube. I guess double check that and make sure it's not too bad for a leak there. Mine is kinked though also.

 

Went back to stock air box and still using the rr racing elbow but not the middle tube eg larger tube maf.
I think I'll have to change out the AOS. Maybe a line is leaking or something.

BTW with this code with the tune will it cause the performance of the vehicle to decrease?

 

Update:

I disconnected silicone elbow and inspected for damage to both the tube and intake box - both looked good. Checked most of the vacuum lines and they too looked good. Got under the car and checked for an exhaust leak near the O2 but found none.

Put everything back together, cleared the stored code and the long and short term fuel trims leveled off between 0-3% correction. Trims remained constant all day yesterday - I will keep logging to make sure all is good.

Not sure if there was a leak somewhere near the intake track that I inadvertently fixed when i put everything back together, but trims are back on point.

Symptoms for me were mainly at idle - I did notice a slight performance decrease. Almost felt like I had filled up on bad fuel.

car is back to running normal once again.

 

Thanks for the follow up. Tons of threads here where we never get to know what ultimately happened. Props for letting us know!

 

Yes sir...!!!

This past Dec my garage queen popped a CEL for no reason..

Visted my local Autozone to borrow use their code reader and to my surprise:

P0172
P0175
P1170

No limp mode, lowest gear is 2nd but will go into 1st once I started rolling..

I hadn't been driving my car or wrenching on exhaust or anything like that so started at the intake.

I did find accumulated aged oil vapor (normal) in the PCV OEM hoses..
So I cleaned those up, same but less amount on interior intake surface..

Then I gave a quick but careful clean up on the MAF. with proper cleaner.

But prior to the light coming on a noticed my exhaust was burning rich almost smelled like I had headers..
More than normal fuel odor on idle.. So I knew something wasn't right..

Seems like a lot of codes for just MAF ?? Right..!!

Soo far cleaning it worked, but I wouldn't be surprised if some of us with older original MAFs will need to start being replaced soon..

There is OEM and also found the OEM DENSO equivalent if necessary..

Joe Z

 

FYI, I used to get P1170 codes randomly (like once per month). When I fixed my valley plate leak I noted it had been leaking for quite some time and I had some build up around some direct injectors with dried coolant. Not sure the relation, but ever since fixing my valley plate more than 9 months ago, I have not gotten a P1170 code or any CEL’s for that matter. If you haven’t fixed your valley plate, take a look and see if you are due.