Author Topic: Unused Plug (Read 3481 times)

ajones13 · « **on:** May 22, 2008, 03:00:40 AM »

Hi guys I tried this in the electrical forum but to no sucess.

I found a plug hanging lose in my engine bay. It is on the same loom as the Round Airflow Meter Plug and the 3 pin throttle position sensor plug. It's a 2 pin plug like the one on the idle control valve. Anyone have any ideas what it should plug into?

My engine is idling badly on startup and running rich. However once it runs for a minute or so it calms down but does misfire. I also get unburnt petrol in the exhaust and the exhaust tips are very sooty. Also when driving it wants to stall when moving of. I have changed all the vacuum hoses under the manifold, the fuel pressure regulator hose and also the ICV. I don't want to spend much more money on replacing what it might be. When I disconnect the Air flowmeter plug the car does run a bit better. The unused plug is close to the AFM so wondering if this has something to do with this?

Hope this is all clear.

Andrew

peerless · « **Reply #1 on:** May 22, 2008, 11:11:43 AM »

There is a vacuum line from the charcoal canister to the side of the throttle body. In this line there is a electronic check valve. You 2 pin wire would connect to that.

May not help your problem but thats where the wire should go.

EN318isPDX · « **Reply #2 on:** May 22, 2008, 11:55:16 AM »

Quote from: peerless;49887

There is a vacuum line from the charcoal canister to the side of the throttle body. In this line there is a electronic check valve. You 2 pin wire would connect to that.

May not help your problem but thats where the wire should go.

+1

Also the only other thing over that side of the motor that uses that plug is the TPS.

Ps pics help alot

ajones13 · « **Reply #3 on:** May 22, 2008, 02:20:27 PM »

Cheers for the responses guys, unfortunately with my car being a UK car it doesn't have the charcoal canister fitted. The Vac hoses are there for it, but tucked away and there is definitley no vacuum on them.

Starting to suspect the Airflow meter, took the airbox lid of and watched the afm door open and close in time with each miss, held it open slightly with my finger and the problem seemed to stop as it looked like enough air was then getting in to allow for a correct air fuel mix. What do you guys think about this theory?

Andrew

EN318isPDX · « **Reply #4 on:** May 22, 2008, 03:06:30 PM »

Highly possible! Either your not getting the right fuel or the right air. AFM is easy to check with an ohm meter. Not sure what you guys call it over there! AFM are alot of cash for a new one so id recommend finding a used one if you can.

punk_sy · « **Reply #5 on:** May 22, 2008, 03:54:59 PM »

Quote from: ajones13;49898

Cheers for the responses guys, unfortunately with my car being a UK car it doesn't have the charcoal canister fitted. The Vac hoses are there for it, but tucked away and there is definitley no vacuum on them.

Starting to suspect the Airflow meter, took the airbox lid of and watched the afm door open and close in time with each miss, held it open slightly with my finger and the problem seemed to stop as it looked like enough air was then getting in to allow for a correct air fuel mix. What do you guys think about this theory?

Andrew

mine a uk car and also has the plug going no where mate

ajones13 · « **Reply #6 on:** May 22, 2008, 04:09:05 PM »

Thanks punk_sy that settles that one. Will replace the air flow meter and hope for the best.

Andrew

moomonkey · « **Reply #7 on:** May 28, 2008, 10:28:19 AM »

First post - And I registered just to answer this question....

DONT replace your AFM - I had excatly the same prob you describe and it turned out to the be Throttle Position Sensor.

I replaced all the tubes. I changed the AFM. I checked the Idle control. It was none of those.

Throttle Position Sensor. Honest.

ajones13 · « **Reply #8 on:** May 29, 2008, 07:52:55 AM »

Hi moomonkey, first many thanks for taking the time to answer my query. How much did the TPS cost? Also I realise I need to remove the throttle body to replace it, however one of the four bolts, on the bottom left beside the nipple for the fuel pressure regulator hose as you look at the throttle body, is a nightmare to remove, I cannot seem to get a socket over the bolt as the Fuel pressure regulator vacuum nipple is in the way. Is there an easy way to do this?

Kind regards

Andrew

EN318isPDX · « **Reply #9 on:** May 29, 2008, 01:11:04 PM »

Quote from: ajones13;50241

Hi moomonkey, first many thanks for taking the time to answer my query. How much did the TPS cost? Also I realise I need to remove the throttle body to replace it, however one of the four bolts, on the bottom left beside the nipple for the fuel pressure regulator hose as you look at the throttle body, is a nightmare to remove, I cannot seem to get a socket over the bolt as the Fuel pressure regulator vacuum nipple is in the way. Is there an easy way to do this?

Kind regards

Andrew

deep socket with a wobble is your friend. I checked my tps with a volt meter and mine was bad above 50% throttle and I didnt have to remove it until I had my new tps and throttle body gasket