93 SS stalls when going wide open throttle. Bunch of Codes!

[SergeyZ]

Ok basically the car has been sitting for about two months. It was not starting, so I thought it was the timing belt. I go ahead and replace:

- timing belt,
- crank sprocket
- crank seal
- key
- crank pulley
- water pump
- thermostat
- both rad hoses

The car still doesnt start. So I check out the fuel pump connection and its all GOOD. Get a walbro fuel pump and install it. Vroooom the car starts right up.

However, the engine light is ON! I decide to drive the car and see how it goes. Once it warmed up, I give it more gas and the car just stalls. It starts up with no problems, but anytime I give it more than partial throttle it stalls.

I connect the black connectors, and check for codes.

- 13 (Cam Angle Sensor)
- 21 (Temp Sensor)
- 22 (Knock Sensor)
- 45 (Pressure Sensor?)
- 49 (Air Flow Sensor)

WoW!!! Where the hell did they come from?!? Then I decide to clear the codes just like Legacy777 says on his website. I tried using the (green & black connectors) method. BUT the check engine light did not flash when I was driving with both connectors connected. Legacy777's site said that the check engine light should flash the all clear signal.

I just disconnected the negative battery cable. Going to try to reset the ECU completely.

[gto7419]

Just so you know, a single problem can sometimes trip the ecu to give multiple codes. Someone on here should be able to give you a better idea of what the problem might be - Im not very good at diagnosing from the multiple codes yet

Danny

[Manarius]

49 is improper air flow sensor. That may be the cause of your issue. The pressure sensor thing sounds pretty important though too.

[SergeyZ]

You guys experience this stalling problem?

[SergeyZ]

The fuel filter has not been replaced for about 70K miles. Would a dirty fuel filter cause the car to stall under load?

I do have a brand new hiflow walbro pump in there.

[greg donovan]

the temp sensor can really mess things up if it is bad.

start there.

[SergeyZ]

I've read that cars w/a bad temp sensor usually have a hard time starting once it is warm. I do not have this problem. It starts right back up once it stalls.

[n2x4]

I see you replaced your crank sprocket and your timing belt, are you sure your timing isn't off? I experienced this on a legacy I had where the timing was way off. It can be tricky to get things lined up correctly. Another issue is if you went off of the notch marks or the arrows. Arrows are wrong.

If you have access to a laptop and can run the scan tool, you can see where your timing is at that way, otherwise just double check to make sure everything still is lined up right.

Aside from that, I'd go after the coolant sensor first, since it's like only $20 bucks. After that, try the airflow sensor.

[SergeyZ]

Yeah I triple checked the timing marks. I used the notches everywhere, NOT the arrows. The car starts up and idles with no problems at all. If the timing was off, wouldnt it idle like crap?

Ill try cleaning the MAF sensor and see what it does.

[Legacy777]

Do you have the silver aluminum MAF sensor?

[SergeyZ]

Do you have the silver aluminum MAF sensor?

Yup its a silver aluminum one. Made by Hitachi.

[SergeyZ]

Should I try cleaning it?

[n2x4]

When my timing was off, I only had an issue when the motor was under load. Idle was fine.

As far as cleaning the MAF, I don't know, I've heard mixed thoughts. If you do clean it, be careful and just use a Q-tip with rubbing alcohol on it.

[SergeyZ]

What was the issue when timing was off?

[n2x4]

What was the issue when timing was off?

heh.

http://bbs.legacycentral.org/viewtopic. ... highlight=

that's my thread. The gear was turned, so it was out of time.

[SergeyZ]

Alright so i was looking around the maf sensor and noticed one of the vacuum hoses disconnected. So I plug it back in. In the meantime I had the negative battery cable disconnected so that it would reset the ecu. I connect the battery and start the car.

No more ENGINE LIGHT! And the car does not stall anymore! I guess it was that tiny vacuum line causing the stalling?

Anyways I got other problems now After driving the car for about 5min, it starts overheating. I pull over and the fans are working just as they should. However the gauge is approaching the Hot mark, so i turn it off. I look underneath the car and coolant is leaking from one of the smaller hoses that go to the water pump.

[n2x4]

Glad it all worked out.

[SergeyZ]

Seems like the car was overheating because there was air in the system. After getting all the air out and adding about 1.5L of coolant, seems good now.

ahhhh the stress!!!