MoshimoGTP

This morning my GTP doesn't start. The car started with the gas pedal press, and just dies . And i try again and the cars dies again . I put the shift on "D" and press the gas pedal and the cars has no power... And dies again ... What I sopouse to do? Help, Tomorrow i gona diagnostic the pcm. But some suggestions or comments are welcome =).

kilroypr

Well, could be that the MAF has failed or the IAT.
Either if those are required to control fuel/air mixture and idle. If that is the case you will have to tow it to the garage.

Ripn12s

what kind of voltage r u seeing from the battery and alt??

And I doubt it is the IAT sensor, you could leave that unplugged and see no problems, maybe an SES light but not always.

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MoshimoGTP

Post Update:

At this night, i try to move the car to my house... and it was hard to start, but i've wait until the engine warms up and the car works fine... Only with the motor is cold has problems. Why?, why cold i have problems and when the motor is warm up (hot) i dont have problems... Sensor?, gasket?, pcm?, car?, motor?,

J.R.

kilroypr

Rpin you are correct, I did not meant IAT I meant IAC(Idle Air Control).
That is used to control engine idel speed and if the computer
receives invalid O2 sensor and MAF sensor reading this IAC
will not allow the car to idle correctly.
Now that I think about it. COuld be the O2 sensor or the MAF sensor
failing. And now that I think further the O2 sensor is on OpenLoop until it reaches it's working temp.
Might be the O2 sensor buggin you and that would explain why the car heats up works acceptably

MoshimoGTP

Update:

This morning i found out that the Boost Meter is too sensible, when i press a little the gas pedal the meter lights come on quickly (or somethimes the boost meter is permanently on). But when the car is hot and works fine the boost meter works normally.

kilroypr

Respectfully, I do not see the relationship here.
The boost engages when the engine revs faster, at idle or when you start it what the SC do put a little more resistant to the starter or idling engine.
If I understand correctly your problem is engin starting and extra rough idling when the car is cold?

MoshimoGTP

Yes, my problem is engine starting and extra rough idling when the car is cold... today my car is on pcm diagnostic. Tomorrow i will send you the codes of that. I live in Baja Mexico, border with California (Calexico, CA.). Im 2 hours from San Diego, CA. And here in Mexico is to hard find a good autoshop.

kilroypr

If you do not have the codes yet, could be the map and/or the O2 sensor(s)

kilroypr

MAF I meant

MoshimoGTP

Yes, my car was scanned, and the results are the MAF Sensor is bad . But, is too expensive, i can put an used MAF???... The 3.8 not SC is the same MAF Sensor??... Okey, thanx for comments. I hope more answers about Engines with the same MAF Sensor... i will find it used or new.

JoeJoe231455

The gtp and gt MAF are not the same. But the fact that it starts when you hold the gas pedal down sounds like your injectors might be dripping and flooding the engine. What is the mileage on the car and when was the last time you had the injectors professionally cleaned?

MoshimoGTP

Joe, my car has 92k miles, and in the GM Parts Direct of El Centro California tells me are the same MAF Sensor for both engines (3.8 Series II). I dont remember when was the last time i've cleaned the injectors but i gonna procced with them. And the MAF Sensor was displayed by the Diagnostic the Check Engine Soon Light are On because MAF is bad (broken).

kilroypr

MAF should not be that expensive. And I would not installed used sensors, they might get debri or humidity and affect them

MoshimoGTP

Here, where i live the MAF Sensor price is about $320 dlls. Is too expensive compared with GM Parts Direct.com ($180). Well, im gonna buy it.