How do I know when my fuel pump is at its limt?

**Kilo_SME** · 03-19-2011, 08:25 AM

Hi, I ask because I have a Atx tt and I get a real bad lean missfire at wot when my transmission goes to shift. On the logger my voltage drops to like 12. 5v at wot in the high rpm range. I'm not even sure what the limit is on the na fuel pump but I'm pretty sure that's my problem. I'm going to get a. tt one or something bigger anyway just to throw it out as a problem. Couldn't hurt to upgrade anyway. Also I want to ask, where does the Atx transmission shift because it looks like I'm hitting redline before it shifts.

Thanks

**Kilo_SME** · 03-19-2011, 09:05 AM

Originally Posted by steve68

Maybe it's showing lean because it's misfiring because the plug gaps are to wide?

Steve

Could that be the problem? Because the gaps are to wide. The guy who owed the car before me had some Ford plugs in and I never the chance to change them.

**Kilo_SME** · 03-19-2011, 09:08 AM

If I get a video up you think you could listen to the missfire and help me out a lil.

**dpartinvr4** · 03-19-2011, 09:57 AM

didn't we decide it was your ECU and you need a wideband in your other thread?

**Kilo_SME** · 03-19-2011, 10:31 AM

The wideband is on its way. But a wideband wont fix why the car is missfiring, and its only during shifts which makes me think its a lack of fuel. I was really just trying to figure of out how to know if my fuel pump was maxed out, but he brought out some thing Im looking into. My plugs are the wrong gap I know of for sure and are dirt old. Why I didn't thing of this before idk but why nit just spend a couple of bucks on some plugs and go from there. I just replace all 3 coil packs but at the time didn't have the cash for the plugs so I never ended up getting them. As far as the ecu goes I've been pmingw 11 second fwd and he said he mad over 400hp on his NA ecu. He also started out as a atx tt and I was told that a wideband solid help me get a good tune goin untill I can get a good tt ecu.

**mb3000** · 03-19-2011, 12:09 PM

Plugs are dirt cheap if you get copper or non resistors.

**green-lantern** · 03-19-2011, 12:51 PM

The NA fuel pump is too small. Get a stock TT or walbro. You will have to mod your hanger to fit the other pump in but it isn't hard to do. As far as gap, I ran around 0.028-0.030 on my 10:1 TT.

**Kilo_SME** · 03-19-2011, 01:20 PM

Do I have to modify the stock tt one to? And I see a walbro in the parts for sale section. This might be a noob question but what is the strew on top off the TB. Not the tPS strew on the bottom,but on top. I turned it a lil and my car stared to idel alot better. Like it was getting move air or fuel.

**green-lantern** · 03-19-2011, 02:02 PM

Originally Posted by Kilo_SME

Do I have to modify the stock tt one to?

Yep, I think you just have to remove the plastic piece on the bottom of the hanger and bend it out a little. Then just attach it to the hanger with one or two hose clamps. I'll see if I have a pic.