Mass air meter

[Mustang87t]

My car is a 1993 coupe. I have an air filter on it and I'm unsure of the brand,no a lot of oil. It's new. And the bbk meter was new in the box in the car when I got it. When I unplug the mass air it surges. Like it would with a stuck iac valve.

[Roger]

Mine is for 24lb injectors. But according to bbk it's for a stock air box. What's the difference

IIRC, the BBK mass air for "cold air" is designed to be used behind a 90 degree inlet like BBK and some other fox body cold air kits. The factory style is designed for a straight inlet like factory or some other cold air kits. I don't know if there is any physical difference or just a tuning change. I think the 90 degree turn going into the mass air changes the air flow and sampling through the meter.

[majorownage]

My car is a 1993 coupe. I have an air filter on it and I'm unsure of the brand,no a lot of oil. It's new. And the bbk meter was new in the box in the car when I got it. When I unplug the mass air it surges. Like it would with a stuck iac valve.

The maf isn't the problem then.

[Mustang87t]

My intake is a straight design. The only bend is right before the TB. I replaced the upper plenum gasket due to it leaking and that didn't help. When I first start it it will run for a few minutes and then die unless you give it gas. And if you try to rev it up a little it studders above about 3000 rpm. So I suspected it to be the maf. I'm sure a tune would solve the problem.

[STRONGNUFF]

My intake is a straight design. The only bend is right before the TB. I replaced the upper plenum gasket due to it leaking and that didn't help. When I first start it it will run for a few minutes and then die unless you give it gas. And if you try to rev it up a little it studders above about 3000 rpm. So I suspected it to be the maf. I'm sure a tune would solve the problem.

In the old day's, you could rotate your maf 90* either way and see if that helps. Theory was that the sampling tube would get a better/accurate read on air flow. Just a thought

[Mustang87t]

ok. heres another question. could the tps sensor have anything to do with it? the throttle body was already on the intake when i got the car just not on the engine. and how do i go about adjusting it?

[91CoupeMike]

ok. heres another question. could the tps sensor have anything to do with it? the throttle body was already on the intake when i got the car just not on the engine. and how do i go about adjusting it?

You need a volt meter, and you need to measure the return voltage on the sensor. .98v at idle and 4.5v+ at WOT. Do this this key on engine off. To adjust it, loosen the mounting bolts and move it. You may have to do some filing to get it right.

TPS wouldn't cause a surging idle, have you checked the IACV?

[Mustang87t]

What I was sayin about it surging is when I unplug the maf it surges like its a stuck iac. Not all the time. My problem is it will run for a few minutes then die when its first started and it has horrible throttle response when it's cold.

[91CoupeMike]

What I was sayin about it surging is when I unplug the maf it surges like its a stuck iac. Not all the time. My problem is it will run for a few minutes then die when its first started and it has horrible throttle response when it's cold.

When it's warm it's fine?

Or does it run like shit all the time? Most of the time when the maf is miscalibtated it will have dead spots in the power band. Atleast from what I've expeiranced. I had a 30# c&l with stock injectors, after around 300 it fell on it's face.

[Mustang87t]

Only when it's cold. It runs great when it warms up

[Mustang87t]

I'm gonna check the tps when I get home today.

[91CoupeMike]

Only when it's cold. It runs great when it warms up

If the mass air were bad it'd do it all the time.

Check TPS and engine temp sensor.

[Mustang87t]

Yeah the temp sensor was my next culprit. Which one is it. There's one for the gauge I know of cause I replaced it. Is it the one in the intake or the coolant pipe?

[91CoupeMike]

Yeah the temp sensor was my next culprit. Which one is it. There's one for the gauge I know of cause I replaced it. Is it the one in the intake or the coolant pipe?

Coolant pipe, the one for the gauge is in the intake and it just has a push on connector.

[Mustang87t]

Ok. So I checked and adjusted the tps. It was at 1.04v and I set it at 0.94v. And it was at 4.6v wot. No difference. So I replaced the coolant sensor in the coolant pipes. No difference. What's the 2 wire sensor on the driver side of the intake? Intake air temp sensor?