Hello all. I'm having a bit of trouble getting the M20 running right.
I followed Bentleys procedures for various tests. Getting a Code 1222.
So far I've narrowed it down to fuel issues.
I setup a fuel pressure tester and my results are a bit weird.
Pressure Tester T'd into the main fuel line going into the rail.
Cold start after a few days M20 runs like garbage sorta holding a 600-500 rpm idle
Cold again with the FPR vacuum line unplugged and the vacuum port on the intake plugged as best as I could. Pressure is around 40-42psi but it looks like its struggling, M20 runs worse.
Fuel Pump jumped FPR vacuum line connected getting correct fuel pressure.
Closed Loop test engine warm FPR connected idles sorta good but low around 600-500 with a cel
The problem is sometimes rail pressure holds, sometimes it doesn't more noticeable that it holds pressure when there is some heat in the engine. Which gives me inconclusive data as to if the injectors are leaking or not. I know the FPR is bad, but I'm trying to rule out leaky injectors or a bad fuel pump as well.
Also when I tried to slowly clamp off the return line per Bentley's instructions Pressure does not go up. There is no fuel in the FPR vacuum line either.
The only time the m20 runs smooth is when I removed the fuel pump relay and for like a solid 10 seconds it idles smooth and runs like a normal m20.
I followed Bentleys procedures for various tests. Getting a Code 1222.
So far I've narrowed it down to fuel issues.
I setup a fuel pressure tester and my results are a bit weird.
Pressure Tester T'd into the main fuel line going into the rail.
Cold start after a few days M20 runs like garbage sorta holding a 600-500 rpm idle
Cold again with the FPR vacuum line unplugged and the vacuum port on the intake plugged as best as I could. Pressure is around 40-42psi but it looks like its struggling, M20 runs worse.
Fuel Pump jumped FPR vacuum line connected getting correct fuel pressure.
Closed Loop test engine warm FPR connected idles sorta good but low around 600-500 with a cel
The problem is sometimes rail pressure holds, sometimes it doesn't more noticeable that it holds pressure when there is some heat in the engine. Which gives me inconclusive data as to if the injectors are leaking or not. I know the FPR is bad, but I'm trying to rule out leaky injectors or a bad fuel pump as well.
Also when I tried to slowly clamp off the return line per Bentley's instructions Pressure does not go up. There is no fuel in the FPR vacuum line either.
The only time the m20 runs smooth is when I removed the fuel pump relay and for like a solid 10 seconds it idles smooth and runs like a normal m20.
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