Map Sensor Question

[thunda1216]

Hi, guys! Here's the skinny: 2003 Turbo Dream cruiser. Cold air intake, MSD ignition, spacer on EGR valve, hi-flo muffler. Recently started stumbling under acceleration, backfires, pops. Worse when cold. Intermittent rough idle. Replaced Throttle position sensor. I think it is the MAP sensor. Before I replace it, am considering hi-performance unit such as 2 bar crane (bosch-type). Anyone here have experience with this upgrade?

[CREWZIN]

Welcome to the forum. Sorry I can't help with your question but I do think your throwing parts at a problem without really knowing what's wrong. You put on a new TPS and that didn't work so now your going for a new MAP sensor?

Anyhow, here's my question: What in the world did a spacer on the EGR valve do for you?

[thunda1216]

I don't know the purpose of the spacer - it was on there when I purchased the vehicle last year - it's obviously an aftermarket part - a nice blue anodized piece...

as the plugs are not fouled and the misfire is intermittent, this would indicate to me that it is not a spark plug problem, as if it were, it should misfire all the time...

It's been my experience that the type of stumble (intermittent, worse at cold operating temps than hot) I'm encountering in a fuel injected vehicle is related to a faulty TPS unit sending improper info to the computer, or the MAP sensor with improper voltages fed to same with resultant improper fuel/timing etc coming out of the computer (garbage in=garbage out)

With all the hi-po mods this already has, I am simply wondering if anyone has any ideas and if anyone has hands on experience/nsight with the 2 or 3 bar map sensors for this particular application.

[CREWZIN]

Originally Posted by thunda1216

I don't know the purpose of the spacer - it was on there when I purchased the vehicle last year - it's obviously an aftermarket part - a nice blue anodized piece...

OH, I get it, you mean a Throttle Body Spacer not and EGR spacer. They come in Blue and Red and don't do a darn thing.

Another question: What about your plug wires? Are the the original wires? Could they be breaking down? The OEM wires from the factory are crap and we advise owners to change them out at the first sign of rough idle, stumbling and hesitation.

[thunda1216]

well, it would be a throttle body spacer if it was attached to a throttle body, but it isn't. it is between the egr valve and where it attaches, down near the turbocharger.

the plug wires are not stock, they are an oversized aftermarket set similar to the 8.8 mm accel set I have on my harley

ty

[thunda1216]

no gearheads present? form over function? whazzup? style over substance?

[MX-5]

Originally Posted by thunda1216

form over function? whazzup? style over substance?

No.
Us professional mechanics would rather gather information from the PCM datastream to determine if a part is not working properly.
We don't throw parts at a car in hopes of a change in driveability.
Every sensor and switch gives a data PID to my scanners. The MAP & TPS are very easy to watch & record for diagnostic research.

No sensor gets changed without recording the datastream before and after. Those printed performance reports verify that the fault is repaired.

[nevinsrt]

Originally Posted by thunda1216

well, it would be a throttle body spacer if it was attached to a throttle body, but it isn't. it is between the egr valve and where it attaches, down near the turbocharger.

the plug wires are not stock, they are an oversized aftermarket set similar to the 8.8 mm accel set I have on my harley

ty

i think your refering to the Mopar noise maker.

and what are your plugs gaped at. you may have too big of a gap by the sound of it.


is it throwing a CEL?