Help diagnosing these faults codes. rough idle.
 

2 weeks ago I started the car. Immediately I noticed the rough idle, felt like it wanted to die down. noticed the CEL go on. Also noticed the accelerator was inoperable. So shut the car off. Good thing I had my PC and Durametric cable handy.

P1502
P1120
P1122
P1121

So I cleared it and car felt normal for the next couple of weeks. Now today I started the car again and same thing..... Idled rough. Pulled the codes again.

P1502
P1504

Cleared the codes again and car drives fine. Any idea what these codes can be?

When did you change the fuel filter the last time. Seems to have something to do wih the fuel pump.

+1 while the codes suggest your issue is fuel pump related, you don't usually get more than a couple warnings like that if the pump is about to fail completely. you'll *usually* get one or two "false starts" ( car starts, rough idle, zero throttle input, then dies..) and then eventually you'll not be able to start the car at all until you r&r. i've had two fp's die and in both cases it was the fuel line ruptured.

i've never had a fp fail though, and let me drive a cpl weeks between start and stall events. so that suggests it may be something else though still fp related. gl w it.

Codes:

P1502
412 Throttle jacking unit, spring test - above limit
Possible fault cause
♦ Throttle part
P1504
410 Throttle jacking unit, emergency air position - signal
implausible
Possible fault cause
♦ No adaptation performed
♦ Throttle part

Clean the throttle body, Then do adaptation.

P1502: Throttle jacking unit, spring test, above limit.

Diagnositic conditions:
Ignition on approx. 30 seconds.
Stationary vehicle.
Egnine not running.
Engine temperature greater than 5C.
Intake air temperature greater than 5C.

Possible fault causes:
Throttle part.

Diagnosis/troubleshooting:

Replace throttle part.
Erase fault memory.
Perform adaptation: Switch on ignition. Wait one minute. Actuate [sic] accelerator pedal. Switch off ignition for at least 10 seconds. Read out fault memory.


P1504: Throttle jacking unit, emergency air position -- signal implausible.

Diagnosis conditions:
Ignition on approx. 30 seconds.

Possible fault cause:
No adaptation performed.
Throttle part.

Note: The fault is entered during the adaptation phase.

Diagnosis/troubleshooting:
Perform adaptation: Switch on the ignition. Wait one minute. Donot press the accelerator. Switch off the ignition for at least 10 seconds. Read out fault memory.

Fault entered: Replace throttle part.

Perform adaptation: Switch on ignition. Wait one minute. Actuate [sic] accelerator pedal. Switch off ignition for at least 10 seconds. Read out fault memory.

Yup I had these codes and once I cleaned the throttle body. They never came back.

I just did the reset, but I ll go ahead and disassemble the y-pipe and clean the throttle body. Worst case scenario, might have to change the fuel filter. How difficult is that job?

not that hard. located next to the coolant reservoir. drop the motor a few inches to some extra room to work with

Worst case is needing a new throttlebody. From the above I'd say it's throttlebody related not fuel filter..

Any idea if any of these are related to having a gt2 slave conversion done. These issues started to pop up shortly after I got the car back from getting new gt3rs4.0 clutch, pressure plate, gt2 slave conversion, gt2 spring assist?

shouldnt have anything to do with the conversion

this is pretty comprehensive http://www.pelicanparts.com/techarti...eplacement.htm

It's not fuel...don't know why you're looking at fuel the codes are all TB related.

Clean your throttle body like we said uptop. Use throttle cleaner and your code will not come back again.

So decided to tackle a few things on the car today on my day off. Replaced all my exhaust/header bolts today since the old were a bit on the rusty side. I found one of the bolts that go onto the turbos were loose so also replaced all of those bolts. Went out for a drive and car felt great. left it in the garage and once again the codes came back on upon startup.

This time:

P1510
P1511
P1120
P1122
P1514
P1507

So I decided to go ahead and take the air filter, Y-pipe off to get to the throttle body. Okay it didnt really seem all that dirty beside the hinges had a tiny bit of build up. So went ahead and cleaned it. Car is still currently apart. Any other idea that could remedy these codes? Don't want to put it back together just yet without getting more insight from the experts.

On a side note I did the throttle reset and 60secs on position/5 secs off position/15 secs on position/off position and watch the throttle body recalibrate, its sits slightly open normally then when it calibrates it closes completely then goes back the slightly open. Is this normal? Just want to make sure what I'm experiencing during calibration is normal.

https://cimg2.ibsrv.net/gimg/www.6sp...3a4fd1aa06.jpg