dhallworth wrote:
Is that a recent rule? I was thinking of booking it again so had best change my of vehicle for the trip it if it.
You need to run a wee self-test on your sarcasmometer ;-)
no10chris wrote:
I’m actually amazed it still works, ive had a few with a phone system, I’ve always just ripped them out. My one now has a roof Aerial from a phone system, I’m going to use the hole to fit a better radio aerial..
I used mine for a VHF aerial, since it's got a standard Panorama base. I just swapped out the little 900MHz rubber duck for a 145MHz whip.
They're not even that hard to do. I've replaced pretty much everything apart from the ECU in my single-point system in the four years I've owned mine.
If I'd started from a completely uninstalled GEMS vehicle I reckon I could have fitted the whole thing in a long day (or split it over two, at this time of year).
oil leak is from oil filter area, took off, cleaned but cannot drive it too far to prove its fixed !
Relief valve O rings, all day long.
If the injector solenoids were shagged and not actually allowing enough gas through, would that cause the differential pressure to be too high?
Certainly seems to be. I now know the tappets are pretty dished (you could serve soup out of the back four) and a new camshaft is on the cards, but it doesn't need to be particularly soon.
Are the reducers adjustable? The single-point ones seem to have a locknut and screw in the high-pressure side that resembles the adjustment in a normal (old fashioned, not crimped together) gas regulator.
It really does have a lot more poke between 2000 and 3000 revs. That blow between pots must have been actually pretty severe!
After much faffing and resetting of adaptives and poking and prodding I crawled underneath and hosed some IPA into the sensor connector and the plug on the lead, which seemed a bit damp. I managed to get some water out, so I flushed it with some more isopropyl and stuck it back together and lo and behold! Off it goes, right up to the rev limiter!
David mentioned that his dads exhibited similar behaviour when the flywheel sensor was on the way out, so possibly the signal was only clean enough at low revs or something. While he was here he reset the adaptives and I moved the throttle pot back to a sane position, so it's a lot smoother pulling away on both petrol and gas although I suspect I need to tweak the gas settings a little. It also looks like one of the lambda sensors is on the way out.
We had a quick look at his VSE too, while we had Testbook on in the shed. It's weird, it seems to be looking for downstream lambda sensors but they are not fitted. I wonder if someone's been fiddling?
I wonder if it's possible the connector is full of crud? With the crank sensor unplugged it won't start at all. I did have that cable unplugged to move the wiring loom out of the way of the head.
So after doing the head gasket my 4.0 GEMS idles beautifully and actually performs not too badly - up to about 2500rpm, at which point it start spluttering and generally won't rev beyond that. It's the same on petrol or gas. There's a fault code stored for the camshaft sensor according to my cheapy ELM327, but when I look at the appropriate pin with the sillyscope I can see the correct two short two long squarewave pulses, looking just like the picture in the manual.
One of the lambda sensors seems a bit lazy, but it was like that before I started working on the engine.
What have I missed here?
That's kind of what I'm hoping. I didn't get a chance to look at it yesterday (bit of a bugger since for the first time in the whole project the weather was perfect!) but I'll look tonight.
It's absolutely silky smooth up to about 2000rpm, even under a considerable load. The blow between pots must have been worse than I thought.
Okay, so it appears I have a fault code for a camshaft position sensor.
Reconnecting the gas just gives me bigger louder pops, so that suggests an ignition problem :-/
Okay, it won't rev particularly high on petrol, sounds like it's being starved of fuel. What obvious thing have I got wrong?
We have so little that requires any more than a "send me an email, I'll fix it next working day", so it's not a biggie.
Clive603 - depends on if you've got big fat bass player paws or not :-)
no10chris - I left mine a bit longer, about as long as it takes to get a beer from the fridge, remember I'm on call, and have a cup of tea instead.
I bought two Draper 16mm impact sockets although I took the first head off with a normal 12-point socket. That's it bolted up, I don't know how critical the angles are but I eyeballed it with the markings on the socket and extension. The second 90° is pretty damn tight!
It's got two chances, I guess...