smart dsm experts help

[95gstclipse]

Here's my problem:my car is running really rich causing my spark plugs I put in foul out in 15 minutes of running.Car also runs a lil rough at idle but smooths out when I rev it.I have a 95tsi ecu in the car hsright now

 

[richard33]

tip #1- use proper English.

 

[Eagle9119]

Are their any mods done to the fuel system?

How many miles are on your car?


o2 sensors? spark plug wires? what type of spark plugs are you using....

Is it a base model or a Turbo?

Also does it smell like gas on start up?

 

[gorf]

big boost leak, bov vented to the outside, someone put larger injector and no way to control them. 255 fuel pump and no afpr etc, etc

 

[95gstclipse]

Sorry for the bad English,the ecu is the Turbo model no mods done to the fuel system.Spark plugs are bosch platinum something ,I do smell gas at start up.

I fixed all boost leaks bov is not vented, stock injectors and fuel system.

 

[Gstclipse69]

Stick with NGK plugs for sure, stock ones are NGK BPR6es gapped at .028. Trash the boschs

 

[Eagle9119]

^^^^ like he said stick with the NGK BPR6es gapped at .028 (copper are better for turbo cars, then iridium trash them!)
my car was doing the same thing..... check your o2 sensor..... also check your spark plug wires. my car was doing the same thing i swapped out the spark plugs and wires and changed my o2 sensor and my car stopped running so rich.... if the O2 sensor IS bad, it creates a lean condition which the ecu will correct by adapting to the rich limit to protect the motor. By creating the rich fail safe condition, your plugs will have a really hard time combusting all of the fuel and will most likely fowl the plugs quickly.
check your o2 sensor and heres a good site for the ngk plugs and wires. wires are like 42 and the plugs come for free......


STM: NGK PREMIUM WIRE SET | 90-99 DSM
i hope this helps you!
enjoy ^.^

 

[95gstclipse]

Thanks man: I have new wires on it so I guess ill change the upstream o2 sensor to see if it changes anything.

 

[Eagle9119]

good haha. let me know how it goes...

 

[tunermt]

o2 sensor, then Maf sounds like you already ruled out any after turbo leaks.

is it all 4 plugs? possibly bad injector sticking open if its not all 4.

try another ECU just for shitz

 

[95gstclipse]

I've already changed the injectors back too stock 450cc ones ; I'm just gonna try the 02 sensor like eagle said and see what happens.Should i put the 95gst ecu back in could this be the problem since i have the 95tsi ecu in it?

 

[16g DSM]

if there both for a 2g turbo and there stock there prob the same ecu. get the plugs we told you to get and go from there after you swap out the o2 sensor. Maybe you'll get lucky and the sensor will be the issue. you don't have some sort of fuel tuning done to it right? apexi, dsmlink, aem ems ect ect...

 

[95gstclipse]

no fuel tuning done to it only has air/fuel ratio gauge.

 

[Eagle9119]

seeing as though they are practically the same ecu, just for two different makes but the same model in their own ways.... it shouldnt matter..... ecu's generally should adapt to the air fuel ratio.... i believe it should set itself, to protect your engine.
When my car was running rich i swapped the o2 sensor and it stopped running so rich....
I would not do anything with the ecu. i believe its fine, but i would try to look up a few ecu forums and see if you can find any differences between the two.... i dont think their are many though....



The ECU of your car is like its brain. For your car to deliver it’s best performance you have to keep it in a fit condition at all times. This is the only way to ensure that you get the best in both driving as well as handling. Modern day cars do not have manual controls. Nowadays sophisticated technology is being incorporated in the form of computerized controls that guide and ensure Engine performance. Whenever you make a physical intervention the data pertaining to such intervention gets recorded in the memory banks of your car’s computer. The computer uses the mapped data to work out the optimum control conditions in which the engine should function. The ECU shuffles through the tons of data that come to it in the form of readings to decide the course of action that should be taken by the engine to ensure an ideal drive. The ECU tells your engine not only what to do but also how to do it. Thus the ECU in order to make accurate diagnosis on engine control utilizes stored data.

 

[Tanro]

Both ecus are the same. Essentially.

But as it is rather easy and free to just swap it back and see if that fixes the problem then I would do that first.

 

[luv2rallye]

Also don't forget that a bad 2 wire engine temp sensor will fool the ECU into thinking it's always cold so it will run it rich. Measure the resistance of that 2 wire engine temp sensor near radiator cap. Should be around 2450 ohms (+/- 240) at 68F and 296 ohms (+/- 32) at 176F. You can also check it's operation by removing it and put in hot/cold water to see if resistance drops/rises.

 

[95gstclipse]

Thanks eagle for the info very informative.Also Ive already changed the temp sensor that was the first thing i changed .

 

[Kyle d32a]

Only way I could see the ecu being the culprit is if you somehow got your hands on a auto ecu instead of a 5-speed or vice versa. A few things are different on the auto's/manuals - I believe turbo and injectors "correct me if I'm wrong" so this may cause the car to run rich if the ecu is set for a different turbo/injectors. Could be something to check into... if you have the stock ecu and it's still good then it probably wouldn't hurt to pop it in and see if it helps.

 

[95gstclipse]

Only way I could see the ecu being the culprit is if you somehow got your hands on a auto ecu instead of a 5-speed or vice versa. A few things are different on the auto's/manuals - I believe turbo and injectors "correct me if I'm wrong" so this may cause the car to run rich if the ecu is set for a different turbo/injectors. Could be something to check into... if you have the stock ecu and it's still good then it probably wouldn't hurt to pop it in and see if it helps.

True car was a auto swapped to a 5speed so im going to put the original ecu in to see what happens later today. I'm putting my money on the o2 sensor being the problem.

 

[Kyle d32a]

Yeah the o2 is most likely old and wouldn't hurt to change that either. Hopefully one of the suggestions listed fixes your problem.

 

[rush2252]

I doubt the o2 sensor being dead would cause it to run so rich it is killing plugs. I would put my guess on the ecu of fuel pressure regulator. I ran my car (95 gsx) without o2 sensors on an aftermarket exhaust that I was fabbing up for a few days and it had no issues.

 

[95gstclipse]

I doubt the o2 sensor being dead would cause it to run so rich it is killing plugs. I would put my guess on the ecu of fuel pressure regulator. I ran my car (95 gsx) without o2 sensors on an aftermarket exhaust that I was fabbing up for a few days and it had no issues.

Well im talking about the upstream o2 sensor that could be bad attached to the exhaust manifold.Ill check on the fpr sounds like that could be a possibility also.

 

[rush2252]

Well im talking about the upstream o2 sensor that could be bad attached to the exhaust manifold.Ill check on the fpr sounds like that could be a possibility also.

If the ecu isnt reading the o2 sensor it will fall into limp mode and keep fuel trims at a set baseline. While o2 sensors can affect gas mileage etc I have never heard of them causing fouled plugs. If this was the case we would be manipulating o2 sensor wave patterns to tune our DSM's...

Basically Im saying dont go blowing $70+ on an o2 sensor and be upset when it doesnt cure the problem. Throwing parts at a DSM is the quickest way to turn it into a partout.

 

[95gstclipse]

If the ecu isnt reading the o2 sensor it will fall into limp mode and keep fuel trims at a set baseline. While o2 sensors can affect gas mileage etc I have never heard of them causing fouled plugs. If this was the case we would be manipulating o2 sensor wave patterns to tune our DSM's...

Basically Im saying dont go blowing $70+ on an o2 sensor and be upset when it doesnt cure the problem. Throwing parts at a DSM is the quickest way to turn it into a partout.

Yea your completely right i just did some research on fpr , I'm really starting to think its that the car sat for over 3 months they say that is a big cause for them going faulty there not that expensive either and fairly easy to replace too.Funny thing is the number one symptom of them going bad is fouled spark plug from it dumping to much fuel .

 

[rush2252]

Yea your completely right i just did some research on fpr , I'm really starting to think its that the car sat for over 3 months they say that is a big cause for them going faulty there not that expensive either and fairly easy to replace too.Funny thing is the number one symptom of them going bad is fouled spark plug from it dumping to much fuel .

Do you have anyway to monitor data on the car while it is running? Not everyone has access to a livestream scanner, but thought I would ask.

If you do check the MAF (mass air flow sensor) If it is not responding or is faulty then it can and will cause the car to run like ass and can cause it to dump entirely too much fuel based off false readings. I know this because I too had a car that sat for forever and ended up replacing the MAF after a similar issue.

Not sounding like an ass but its located directly behind the passenger side headlight on the 2g and has a wide connector hooking into it. Will also have piping from the filterbox down to the intake side of your babyeater (turbo)

PS and just because IM bored go and snap some pics of the engine bay, I might see something that screams red flag!