L322 better but still not perfect HPFP?!

Steven911 said:

better but still not perfect HPFP?!

Dear members,

I am still trying to figure out why my LM322 has a rough idling.

The following symptoms are known:

-car has a rough idling (see video below)
-while driving it is noticeable that the car hesitates to accelerate
-when engine is cold the vehicle starts right away, whereas driving it for 30 minutes and then trying to restart after a short break won´t let you restart. If I manage to restart it than the rev. meter shows 500revs and there is no way to move the car by hitting the pedal. Even the rev. meter stays at 500. After 30 min. when engine cools off then it starts without hesitation.



The following has been done so far:

-new low pressure fuel pump
-gas tank was cleaned mechanically
-I put in new high quality gas


Now:

Car runs a bit better but the above mentioned symptoms are still evident

What could be the final solution???

-camshaft?
-crankshaft?
-lobe/follower?
-high pressure fuel pump?


And if it is the pump, what are the most common parts which fail…instead of changing the costly entire pump.
I am very thankful to any tips and hints …in order to end this never ending agony…

Best regards

Steven

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Lezley said:

Just chucking in my experience, I had a rough idle on mine after I had issues with non start due to a blocked high pressure pump. We had used easy start, yes I know, this seemed to dislodge a lot of crap in the air inlet manifold. There is sensor at the back and this was covered is sludge, I presume created by easy start and soot mixed together. There was no errors thrown, it just idled roughly. The sensor is round the back of the air inlet towards the firewall. Removal is one bolt, might be worth taking it out and polishing it. I cleaned the whole inlet manifold after removing it from the car. Cured my issues, I tried all sorts before that, injectors out and tested, new MAF, ERG strip and clean.

I could be wrong and I sure someone who knows better will be along shortly.

Click to expand...

Lezley said:

Just chucking in my experience, I had a rough idle on mine after I had issues with non start due to a blocked high pressure pump. We had used easy start, yes I know, this seemed to dislodge a lot of crap in the air inlet manifold. There is sensor at the back and this was covered is sludge, I presume created by easy start and soot mixed together. There was no errors thrown, it just idled roughly. The sensor is round the back of the air inlet towards the firewall. Removal is one bolt, might be worth taking it out and polishing it. I cleaned the whole inlet manifold after removing it from the car. Cured my issues, I tried all sorts before that, injectors out and tested, new MAF, ERG strip and clean.

I could be wrong and I sure someone who knows better will be along shortly.

Click to expand...

Steven911 said:

Dear Lezley,

could you please indicate where this sensor is located exactly?

Thank you in advance.
Best regards
Steven

Click to expand...