3.2 fuel pressure tester?

[Rev-it 84]

I need to find a lean running problem, does anyone know where I can find a Fuel pressure tester/gauge that will fit the 3.2 fuel rail. Thanks

[cgarr]

This is what I used, I got the pressure gage from Sears several years ago and made an adapter to fit the rail, it threaded using a 12X1.50 mm tap.

[brighton911]

Craig Thanks for posting the picture of your adapter, nice and simple is always good and the price is about right.

[cgarr]

How do you know its running lean? There is a rotary switch on the dme that you can use to make it run richer.

[911st]

I put my car on a dyno and found I was lean above 5k rpms. Had them put there wide band in the O2 an unplug the stock one.

If one is lean at idle I suspect the O2 will pick this up and try to adjust around it.

[jlex]

I ran nearly an identical question on this forum about a week ago: I needed to know the thread & pitch of the test port on the fuel rail as I had purchased an inexpensive tester over the internet which didn't fit; thought I could get an adapter. One guy said he thought it was size 14M. Maybe it's like your guy said, "12 X 1.5mm" instead. Looks like making your own adapter is the only answer unless you want to spend a lot for a one or two time use.
regards,

jlex.

[Rev-it 84]

Your adapter set-up looks like a winner. I was thinking about using a spare fuel rail cap and brazing or tapping a fitting on the end to hook up a standard pressure gauge like yours from sears. I just wanted to keep it simple, but as always with our P-cars; to do it right, it takes a little extra work. The reason I found the lean running problem is when I removed both heatexchangers and x-over tube to find an exhaust leak on the left cyl-bank, all 6 exh. valves have a very light gray color to them. Compression test showed 170psi on all 6, no head stud problems, and the engine has excellent power and torque. The engine has appx. 5000miles since overhaul and the exhaust leak was present prior to rebuild.
My fuel pump and pressure reg has 165000 on the clock, so I figure that with low op pressure I may not have the volume. I may be barking up the wrong tree.

[KTL]

Doesn't the the adjusting pot behind the metal plug on the air meter adjust lean-rich (CO %)?? I thought the rotary switch inside the Motronic ECU is technically called a "fuel quality" switch?

[CruiseControl]

I went to the local hydraulic hose service shop and had them make up adaptor and hose. The hose side fitting for the 3.2 test point is M12 x 1.5 (female) with male cone.
Your resolve your question as to adequate fuel pressure, you would need to monitor pressure at engine full load (full throttle at about 4500-5000 rpm) to confirm adequate pressure at the maximum required flow.
Assume you have elimated blocked fuel filter(s) as potential restriction.

Why not first do a quick run up on a dyno to confirm lambda under full load and also steady throttle. At least this will tell you if you need to look further.

While installing an after market ECU I added fuel press, fuel temp, left and right LA, as some of the additional data points to monitor. These data points can be displayed on the mini dash display and also be logged for later review. Makes diagnostics much easier.

Paul