maf or a vaccum leak.

check your fittings

 

A bigger tb without a ported upper intake manifold can hurt performance

 

So does the MAF need to be replaced? or??? I have no idea where to start wit this problem. It is not a minor problem at all, the surge is really like tapping the break HARD all the way up the hill.

 

if your maf was bad you would be throwing a code by now.



I personally think that you might have missed something when installing it or something came loose.

it happened to me when I had my v6.

car was sputtering hard out of no-where and eventually died.
I couldn't get it to start back up...

once I popped the hood I saw that the intake popped off at the elbow a little bit after the maf so it threw a false cel.
i put it back together and reset the battery and the car ran fine.

 

Check for vaccuum leaks, and if that doesn't help take off the tb

 

just wondering, what exhaust setup do you have? Is it still stock? Your pulling alot of air in now compared to before. Someone here once told me that the "speed" of the air coming in is just as important as volume. To increase both is ideal. Maybe dual exhausts will help balance things out. IDK...

I know that I lost power when I put in my first mod (exhaust). Then I put in a better intake and it made everything great. Inhale well, exhale better and you'll be safe.

 

just because he installed a CAI doesnt make his exhaust too small. basically with the aftermarket CAI's they just move where the air is being brought in and give you the ability to draw more air (forced induction when you get it) a stock intake can still draw in alot of air. on a stock engine a CAI isnt gonna give you so much airflow that you need a bigger exhaust. personally i would check all of the sensor fittings and make sure that a sensor plug wasent sealed.

 

I had many problems with mine when i installed it. I had to take it to the Ford Dealership and they found a piece broke where the throttle body connects to the wiring and then they tuned it. Now it works amazing...you might have to do the same :dunno

 

yea sounds like a bad connection between the sensors and computer

 

What about the aftermarket throttle body? Im just thinking out loud... does that let more air through????

 

when it does kick in, does it kick in with full power??

plug wire in the wrong spot...

 

What about the aftermarket throttle body? Im just thinking out loud... does that let more air through????

it does but doesnt allow significantly more. not so much that it would be a problem. hell, check the gasket on the tb.

 

BBK with a TB should have a tune your getting more air and ur car don't know what to do with it. Ive read a few times where people get weird things with the BBk intakes and TB a tune fixed there issues.

 

I've double and triple checked all the plug wires (it isn't missing all the time, just on load with a surge too), all the gaskets and seals seem to be in place. One thing that does bother me is the seal in the extra hole that existed in the top tube on the cold air kit. There was nothing in the instructions about what to do with that - so I plugged it with what seemed like the right piece.

I have to say it... the instructions with that cold air kit just sucked. So, I really have marginal confidence that this is installed perfectly correct.

I may just take it to Ford and just drop the dime to get them to tune it. I am getting an occasional code from something, but it has not dropped anything on me in the last couple of days.

 

I've double and triple checked all the plug wires (it isn't missing all the time, just on load with a surge too), all the gaskets and seals seem to be in place. One thing that does bother me is the seal in the extra hole that existed in the top tube on the cold air kit. There was nothing in the instructions about what to do with that - so I plugged it with what seemed like the right piece.

I have to say it... the instructions with that cold air kit just sucked. So, I really have marginal confidence that this is installed perfectly correct.

I may just take it to Ford and just drop the dime to get them to tune it. I am getting an occasional code from something, but it has not dropped anything on me in the last couple of days.

Ford wont tune your car. Ford Motor Company Strictly Prohibits any ford dealership From modifying Ford PCM's. You will have to take it to a performance shop for a tune. and also make sure that Hole is plugged thats the spot for the IAT some cars don't have it. On the air box any more. Ur probably getting un maff'd air through that hole.

 

this may sound really dumb, but make sure the filter/maf is still connected to your pipe. I had a similar problem after my vortech was installed. One day I started driving and the thing kept surging and I would stomp the gas and maybe a sec or 2 later it would catch up. So I pull over and turns out the filter with the maf connected to it had separated itself from the rest of the pipe down in the fender, and it was just hanging there by the plug going into the maf. So the engine wasnt breathing good. Stuck it back on there and tightened the hose clamp and it was good to go.

 

well that fender installation is a pain - took me a couple of hours to get it up there and on the pipe since it goes in through the bottom of the fender and not through the hole on top. It is a completely blind installation of that thing - so good point. I'll check it on that side again to make sure I am getting a good seal everywhere.

 

yeah it's especially hard if you dont have anyone to help you hold it still while you are under the car with your arm in the air.

 

What about the aftermarket throttle body? Im just thinking out loud... does that let more air through????

it does but doesnt allow significantly more. not so much that it would be a problem. hell, check the gasket on the tb.

It doesn't anymore air if ur not ported... is like having a 4 ft door with a 4 ft ceiling.. then u change the door to a 7 ft one but dont adjust the ceiling... it would be the same as having the 4ft door cause the ceiling is restricting....



besides that check all connection maybe u got a sensor mixed. Vacuum leak or w/e.... after that get a port and polish to really see performance gains

 

Cangri... awesome answer brother...

 

These kind of mods r my thing i know my **** about injector maf and other

 

the air/fuel will be thrown off...regardless of the intake being ported/polished...your taking in more then usual air...even from just a CAI alone....so it will run better when the car is tuned for the correct settings over the stockers.....this has nothing to do with the MAF sensor...you dont make enough power and take in enough air to worry about that

 

He doesnt need a tune for those mods, he can get away without it

 

Ah HA! I found it.

After putting on the Headers and the exhaust I found that one of the spark plugs had cracked. It appears that those NGK iridium plugs are extremely fragile.

Some casual conversation at the Auto Parts shop was quite enlightening. The counter nerd said that they have a very high return rate on those because they are so delicate. It seems that they have a high breakage rate from the factory and just any bump at all will cause them to fracture. They are MUCH more fragile than a standard platinum plug. His comment is that they probably have one in every 5 sets that is broken by the time it gets to the customer.

I had completely missed this because it would run fine with the lead tester and every plug was firing and all the wires checked perfect. Same case with the Mass Air and the oxy sensor on the exhaust. All tested great on the stand. BUT... on the road under load it would just start missing and backfiring like a demon. I decided to just start from ground zero and pulled out all the plugs and #6 just fell apart in my hand when I took it out.

Hope this helps someone down the road (so to speak).

Thanks everyone for your suggestions and comments. I hope this solves the problem. I'm off to take it for a long ride in the hills just to make sure.

 

now get a PnP (port and polish) to take advantage of the new bigger t.b