car idles as you give it gas it stalls out

[muddfisher85]

I just got this car running for the first time. And this is my first turbo car. Any ideas of what it could be?

 

[GSTOMPN]

Sparkplugs/Wires
Fuel Filter
Fuel Pump

 

[gsx7707]

mass airflow sensor.make sure its plugged in and working

 

[muddfisher85]

the fuel pump makes a loud humming noise I did notice that today. Bad fuel pump you think?

how do you check the mass air flow sensor it did have another one in the back of it that had a crack in it to could it have the wrong one?

So I changed the mass air flow with the other one that was in the car it looks in better shape, not sure how to test it still. I went to fire it up and it would not start again my guess is plugs are fowled again. The air fuel ratio gauge said it was running really rich and you could smell gas coming out of the exhaust. I am going to clean the plugs and see if that helps this evening.

 

[talondave]

Like stated above, sounds like the maf isn't reading air flow as you apply the throttle!

 

[kqodprez]

Either that or a massive boost leak! Is there a cel on? The Mas being bad or unplugged would throw a code...

 

[muddfisher85]

So now I cant even get it to start again you turn it over and it acts like it wants to go for a split second then nothing and the plugs were fowled again from running to rich but now I am stumped. Think its to cold or water in the gas lines that have frozen only letting a little gas to the engine. I can smell gas when trying to start it and switching the mass air flow didnt seem to make a difference on starting any way
when trying to start it after it putters and trys to start then you turn the key off at that point the air fuel ratio gauge is still on and reads rich but the car is not running 10 seconds after that you hear a click like a relay turning off then the air fuel gauge is off . and it will almost start again after that 10 seconds each time but still wont start. Could the ecu be doing this stoping the car for sparking. I even tried switching the relays for the fuel pump and what ever the other one was right beside it same result just clicking. I did see one time while waiting for the 10 seconds a small spark near the ecu when the relay clicked

Will the car start with the maf unhooked?

 

[ineedagsx]

replace the gas filter/ make sure your not leaking out (put a few pieces of cardboard under the car try starting it, then move the car) but it really sounds like your maf isnt working properly, try unplugging the maf all together and see if it will at least kick over.

 

[muddfisher85]

So I finally got the car running again. The only thing is that this time i noticed that when I unplug the ecu and tried the other one I have. With this other one, but as soon as i plug the other one back in the car fires up but still misses a little and has a hardtime idleing. How can i check the ecu can I take it to the dealer or what? But that is how i got the car running the first time too swapping the ecus. All the wiring seems to be fine. How can you tell which ecu is for which engine?

 

[eclipse-gs-t]

ok guys yesterday my car was fine but today in the morning it give me a hard time trying to start my car but it did so uff good, then when i took it for a ride wont pass 2k i dont know why and it will do it for all gears so i stop, open the hood trying to find out what it is then i unplug the 3''gm maf and didnt do anything, plug it back on and wont do anything so i guess is my 3''GM maf what do you guys think? If that's the case then i need a new or used GM maf anybody has a extra one Ill pay for it please help me

 

[muddfisher85]

So come to find out I had a walbro 255LPH fuel pump that was causing all of my issues. I just need to install a AFPR. Thanks for the help

 

[DaisyTuner]

i doubt the fuel pump was causing the problem, the humming is what youre suppose to hear with that pump, maybe it was the fact that you dint have an upgraded fpr to go with it tho.

 

[crusindregs]

I occasionally have this problem too when i unplug the MAS the car will run and not stall but hesitates like nuts after 2k in any gear so i have to grandma it home. I found my problem one of the times to be an intake couple that came loose and as soon as i fixed that and plugged the MAS back in it was good to go.

 

[muddfisher85]

i doubt the fuel pump was causing the problem, the humming is what youre suppose to hear with that pump, maybe it was the fact that you dint have an upgraded fpr to go with it tho.

maybe it was the fact that I bought it like that not running. I put a stock one in and whola fixed

 

[GooeyGus]

Coolant temperature sensor

Mine did the exact same thing when I forgot to plug it in.

I'd be willing to bet money that this is your problem.

 

[muddfisher85]

Coolant temperature sensor

Mine did the exact same thing when I forgot to plug it in.

I'd be willing to bet money that this is your problem.

It reads the temp fine but those wires were messed up I had to replace the end and extend it a little. It does seem to miss now after it warms up but the check engine light came on now so thats where im checking next my guess one of the coils is going bad.

 

[GooeyGus]

It reads the temp fine but those wires were messed up I had to replace the end and extend it a little. It does seem to miss now after it warms up but the check engine light came on now so thats where im checking next my guess one of the coils is going bad.

The temp sender for the ECU and the temp sender for the gauge are two different sensors.

You want the one for the ECU. It should have two pins in a sideways T shape. At least that's how it is on a 1g, I'm pretty sure it's like that on a 2g as well. It is screwed into the lower part of the thermostat housing.

Check the wires, if they are good, replace it. It's pretty cheap (around $20 I think) and a common problem.

***BUT*** before you do any of that, find out what your CEL says.

 

[muddfisher85]

On a 2g its a one wire sensor 14 bucks. I think I will replace it just to safe. Thanks for the help ill let you know if it helps.

 

[GooeyGus]

On a 2g its a one wire sensor 14 bucks. I think I will replace it just to safe. Thanks for the help ill let you know if it helps.

Make sure it is the sensor for the ECU and not the gauge. I'm pretty sure they are all two wire.

For a 2g, I'm pretty sure it should look like this:

You must be logged in to view this image or video.

The sender for the gauge, which is the one you DONT want (unless your gauge doesn't work), looks like this:

You must be logged in to view this image or video.

 

[muddfisher85]

Ok the two wire one is the one that had no plug on it. Just some wire connectors that were loose. I extended the wire so it wasnt as tight the put new connectors on the ends. Now I wasnt sure if it mattered which wire went where, so i just put them back where they were. Does it matter? If so which one goes where? I have both those sensors so its the same for both 1g and 2g i was wrong thanks

 

[GooeyGus]

Im pretty sure polarity does matter. Try swapping them and see if it runs better.

If the ecu gets no signal or a bad signal, it will think the engine is super cold and will dump fuel like crazy.

My car would start but would fall on it's face if I hit the throttle. Most of the time they won't even start.

 

[muddfisher85]

So I Got a code reader from my friend. Here is what it said was pending P0115 Engine Coolant Temp Circuit Malfunction, P0110 IAT Sensor Circuit Malfunction, P0100 MAF or VAF A Circuit Malfunction, P0105 MAP/BARO Circuit Malfunction.

Turned out the ECU was bad. Swapped it out now everything works good. Thanks