Project Car / Motorbike thread. Let's see 'em.

Haakon

has moral fibre, who'd have thunk that?
Megane has been driving me nuts today... I had a quick inlet manifold gasket repair to do and a couple of last assembly items and then it was going to be parked and I’d spend the day assembling the orange. No...

Stumbling idle, cycles up and down. Typing vacuum leak I thought, hence new manifold o rings. Nope. Fuck... Swap electric throttle body over, no joy. Fuel filter had to be done anyway, nope. Shit. Plug in computer, it’s got a misfire when it stumbles. Coils swapped, nope. Plugs - no. Shit. Fuel pump sounds like it’s changing tone with idle fluctuations - that’s a shit of a job with a full tank... Oh well, the spare pump from the old car is new and this one is unknown so that’s get swapped. I smell like petrol now... No joy. Double fuck.

Still on the misfire thing, so pull rail and injectors and squirt them out with carb cleaner. Nope. Now im getting annoyed. Cam dephaser can muck with idle, even though it was fine last time the engine ran in the other car. Swap for spare. No. Hotwire it with engine “idling”. Nope, runs worse when activate, so it’s as it’s supposed to be - inactive at idle.

Back to basics. Run throttle body initialisation again. Pull Pcv valve and check, plug hole to see if it was leaking. Do same for brake booster line, canister purge line, MAP sensor. Nope.

I think I can hear an intermittent hiss somewhere when it stumbles and tries to stall. Last thing to try tomorrow is run glue along the seams of the plastic inlet manifold in case maybe it got dropped while it was off the car and split a seam...

After that, dunno... I swapped the crank angle sensor just in case, and then it’s a computer problem. It ran fine when it was last turned off... And it starts well and idles well when cold for about 30 seconds - if the flywheel signal teeth or the computer was bad it wouldn’t run well at all I’d have thought.

So no progress on the orange....
 
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Flow-Rider

Wheel size expert
Megane has been driving me nuts today... I had a quick inlet manifold gasket repair to do and a couple of last assembly items and then it was going to be parked and I’d spend the day assembling the orange. No...

Stumbling idle, cycles up and down. Typing vacuum leak I thought, hence new manifold o rings. Nope. Fuck... Swap electric throttle body over, no joy. Fuel filter had to be done anyway, nope. Shit. Plug in computer, it’s got a misfire code. Coils swapped, nope. Plugs - no. Shit. Fuel pump sounds like it’s changing tone with idle fluctuations - that’s a shit of a job with a full tank... Oh well, the spare pump from the old car is new and this one is unknown so that’s get swapped. I smell like petrol now... No joy. Double fuck.

Still on the misfire thing, so pull rail and injectors and squirt them out with carb cleaner. Nope. Now im getting annoyed. Cam dephaser can muck with idle, even though it was fine last time the engine ran in the other car. Swap for spare. No. Hotwire it with engine “idling”. Nope, runs worse when activate, so it’s as it’s supposed to be - inactive at idle.

Back to basics. Run throttle body initialisation again. Pull Pcv valve and check, plug hole to see if it was leaking. Do same for brake booster line, canister purge line, MAP sensor. Nope.

I think I can hear an intermittent hiss somewhere when it stumbles and tries to stall. Last thing to try tomorrow is run glue along the seams of the plastic inlet manifold in case maybe it got dropped while it was off the car and split a seam...

After that, dunno... I swapped the crank angle sensor just in case, and then it’s a computer problem. It ran fine when it was last turned off... And it starts well and idles well when cold for about 30 seconds - if the flywheel signal teeth or the computer was bad it wouldn’t run well at all I’d have thought.

So no progress on the orange....
Spray the areas that you think are leaking with CRC or carbie clean, you'll notice if there's an air leak.
 

Haakon

has moral fibre, who'd have thunk that?
Spray the areas that you think are leaking with CRC or carbie clean, you'll notice if there's an air leak.
Yep, tried that. Catch is the seam of the two halves of the manifold that are bonded together are not accessible even with the tube on the carb cleaner can nozzle... Even did the hillbilly stethoscope with one end of a tube in an ear and the other fed under looking for the leak (I got really good at this learning to balance twin SU carbs back in the day...). It’s an elusive leak if that’s what wrong.
 

Haakon

has moral fibre, who'd have thunk that?
How good are cars!

Anyway, test drive shows rear beam bushes have next to no NVH hit & the outcome to steering precision & chassis stability is what I'm after. Sweet!
Glad someone had a win!

A couple test drives today also reminded me why I’d taken out the Eibach springs and gone back to OEM springs on the old car - they’re shit and too low and smash the bump stops. Not sure why I forgot about that and thought I’d use them again with this car... This series of megane do sit quite high standard, but they don’t like to be lowered...

So will add that to the job list if I ever get the fucker running properly!
 

Flow-Rider

Wheel size expert
Yep, tried that. Catch is the seam of the two halves of the manifold that are bonded together are not accessible even with the tube on the carb cleaner can nozzle... Even did the hillbilly stethoscope with one end of a tube in an ear and the other fed under looking for the leak (I got really good at this learning to balance twin SU carbs back in the day...). It’s an elusive leak if that’s what wrong.
Can you plug it where it joins to the tappet cover? You should be able to check vacuum in the plenum with a vacuum gauge.
 

Haakon

has moral fibre, who'd have thunk that?
Can you plug it where it joins to the tappet cover? You should be able to check vacuum in the plenum with a vacuum gauge.
It’s a long seam along both sides of each intake runner (which are about 20cm each). It was all too hot and I was too demoralised to do this today, but if feeding (epoxy/silicone sealant/superglue - not decided yet...) into the seam doesn’t sort it im going to kick myself for thinking I was done and throwing out the other manifold and buy another one from my friendly Reno wrecking in Melbourne...
 

Haakon

has moral fibre, who'd have thunk that?
Can you plug it where it joins to the tappet cover? You should be able to check vacuum in the plenum with a vacuum gauge.
I can check vacuum with the laptop. It’s going up and down, and another thing is to plug it in again and watch the map sensor telemetry closer see how it tracks with revs and injector duty cycle. They all go up and down, the ECU is definitely trying to compensate and adapt and it just can’t keep up...
 

link1896

Wheel size expert
It’s a long seam along both sides of each intake runner (which are about 20cm each). It was all too hot and I was too demoralised to do this today, but if feeding (epoxy/silicone sealant/superglue - not decided yet...) into the seam doesn’t sort it im going to kick myself for thinking I was done and throwing out the other manifold and buy another one from my friendly Reno wrecking in Melbourne...
Time for a smoke machine.

You can diy one easily.
 

Haakon

has moral fibre, who'd have thunk that?
Put some silicone along an underside seam on the manifold, put it back on and started it before the silicone had set. It got sucked in.

New manifold time... Guess I must have dropped it at some point over the last year it was off the engine.
 

Haakon

has moral fibre, who'd have thunk that?
The French shitheap that keeps on delivering...
Cant really blame the car for this one... Geez I wish id kept the other manifold though :( Not the first time pushing back against my magpie tendencies (in an effort to reduce the amount of random crap ill never need accumulating...) has bitten me in the arse!
 

Ultra Lord

Hurts. Requires Money. And is nerdy.
Cant really blame the car for this one... Geez I wish id kept the other manifold though :( Not the first time pushing back against my magpie tendencies (in an effort to reduce the amount of random crap ill never need accumulating...) has bitten me in the arse!
Give up on it and stick to not finishing a bike build.
 
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