P38A 4.6 V8 won't pull, sluggish, otherwise runs fine.

pwood999 · Sep 14, 2023

Did they fit the correct cam sprocket ? The later one has the gaps in different places & will screw up the cam sensor timing.

GEMS only uses the cam sensor for fine fuel adjustments & knock strategy. You can try unplugging it, and see how it runs then.

Also what's the compression like ?

MrGorsky · Sep 14, 2023

pwood999 said:
Did they fit the correct cam sprocket ? The later one has the gaps in different places & will screw up the cam sensor timing.

GEMS only uses the cam sensor for fine fuel adjustments & knock strategy. You can try unplugging it, and see how it runs then.

Also what's the compression like ?

No Idea! I paid a clever man to rebuild it, and assumed he'd make a proper job of it! It came with a new refurb front cover and oil pump so I haven't seen any of that. What would I expect from unplugging the cam sensor? Would it just stop running or would it just run worse?

I haven't done a compression test on it, it's been completely rebuilt so I assumed it'd be perfect. That is next on the list though.

MrGorsky · Sep 14, 2023

I think I'm going to unplug and re plug everything back in too. The motoring equivalent of turning it off and on again.

Datatek · Sep 14, 2023

Binding brakes after it has been stood for a while?

MrGorsky · Sep 14, 2023

Datatek said:
Binding brakes after it has been stood for a while?

Thanks Datatek. Checked that, things were a bit rusty, but all the wheels turn freely when off the ground. Plus it rolls at very slow speeds on the flat so I don't think there's any binding.

pwood999 · Sep 14, 2023

MrGorsky said:
No Idea! I paid a clever man to rebuild it, and assumed he'd make a proper job of it! It came with a new refurb front cover and oil pump so I haven't seen any of that. What would I expect from unplugging the cam sensor? Would it just stop running or would it just run worse?

I haven't done a compression test on it, it's been completely rebuilt so I assumed it'd be perfect. That is next on the list though.

I had bad connection to the cam sensor on mine for several months. It ran fine but has error code in Nanocom. No engine lights at all !!

Cam is unlikely to be wrong, but if one tooth out compression would probably be down.

Cam to crank sensor timing needs dual channel oscilloscope to check it.

MrGorsky · Sep 18, 2023

Well it's not blocked CATs. After a rather loud test drive up and down it's still sluggish. Didn't get the chance to put it back together brfore the heavens opened, but I'll do a low range test as soon as I can find an evening to do it.

Grrrrrr · Sep 18, 2023

kermit_rr said:
Fuel pressure would throw at least one error code, run lean, o2 readings would be out, possibly pop and bang

It does pop a bit. Particularly on overrun.

We took the exhausts off yesterday and ran it down the road. Utterly awesome noise (like thunder in a jar) but still down on power.

kermit_rr · Sep 18, 2023

it will pop/burble a bit on overrun if its got a decent cam in

MrGorsky · Sep 18, 2023

I'm startying to wonder if it's something gearbox related rather than engine. I think going through it all again checking everything it plugged in and seated correctly is necessary.

pwood999 · Sep 18, 2023

Can you do a live data recording ? Nanocom is a bit slow for this but can be useful. A modern generic OBD with live data can access GEMS so might give more help ?

MrGorsky · Sep 18, 2023

pwood999 said:
Can you do a live data recording ? Nanocom is a bit slow for this but can be useful. A modern generic OBD with live data can access GEMS so might give more help ?

I can do one with the Nanocom. That's prbably the best I can mange easily. Just live data for all the engine sensors is what I need to do is it?

pwood999 · Sep 18, 2023

yes. Then share the CSV file on here. Might be worth doing the same for gearbox to see if it's getting sensible info from the engine ECU.

MrGorsky · Sep 18, 2023

I'm slowly going down the rabbit hole of doom!

I can do a live recording no problem. Let's see what we see.....

kermit_rr · Sep 18, 2023

MrGorsky said:
I'm startying to wonder if it's something gearbox related rather than engine. I think going through it all again checking everything it plugged in and seated correctly is necessary.

does it tell you what gear (eg. D) you are in via the dash display? if not then you're in limp mode, which is 3rd gear

MrGorsky · Sep 18, 2023

kermit_rr said:
does it tell you what gear (eg. D) you are in via the dash display? if not then you're in limp mode, which is 3rd gear

I'll check it. It does tell you what gear you're in on the Nanocom, but I can't remember if that's reflected on the dash. Would limp mode come up as a fault in the Nanocom? Because there are no faults on the Nanocom.

kermit_rr · Sep 18, 2023

MrGorsky said:
I'll check it. It does tell you what gear you're in on the Nanocom, but I can't remember if that's reflected on the dash. Would limp mode come up as a fault in the Nanocom? Because there are no faults on the Nanocom.

i'm pretty sure it shows in the nano gearbox section, still worth checking the dash to make sure it says D, does the sport button work?

MrGorsky · Sep 18, 2023

kermit_rr said:
i'm pretty sure it shows in the nano gearbox section, still worth checking the dash to make sure it says D, does the sport button work?

Sport button certainly lights up.... I haven't done a specific test, so I can't be sure it's changing the changes (if you see what I mean) or not.

MrGorsky · Sep 18, 2023

Nanocom files....

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The gearbox one has illegal charaters apparently so it night not work.

I'm not sure what it shows really but I'd appreciate some other opinions.

kermit_rr · Sep 18, 2023

t

MrGorsky said:
Nanocom files....

WeTransfer | Send Large Files Fast - Up To 2GB Free

The simple, quick and secure way to send your files around the world without an account. Share your files, photos, and videos today for free.

we.tl

The gearbox one has illegal charaters apparently so it night not work.

I'm not sure what it shows really but I'd appreciate some other opinions.

he one that really stands out.. volts
9.x is waaaayyyyy too low and certainly a cause of at least some issues, including limp mode

get it charged up, at such a low voltage it might be dead
if the actual voltage is ok then you have a connection issue

P38A 4.6 V8 won't pull, sluggish, otherwise runs fine.

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