Been driving the new S, have some concerns...
Discussion
I picked up my car from the port on Thursday and got it legal on Friday, which was a breeze (no 'MOT' for a year from now).
This is the best sounding car ever! I thought th old Alfa V6 sounded good, but this is wonderful! A very involving drive that needs a fair amount of muscle to throw around. The car was bought sight unseen and has turned out to be in incredibly good shape.
A broken negative battery clamp took a while to track down as the cause of a starting problem this morning, but at least I fixed the dreaded yellow connector while I was at it! I missed any chance of going to the big show in SC though.
When cruising, I thought it had a misfire but after checking the plugs and pulling one lead at a time, I can't find any clues. It has this surging that seems to be coming from the diff rocking, then making the propshaft thrust the gearbox up an down. It's hard to explain, and it isn't very serious, but maybe it rings a bell with someone?
Anyway, must go for another spin - its 75deg out there with not a cloud in sight!
Cheers,
David
This is the best sounding car ever! I thought th old Alfa V6 sounded good, but this is wonderful! A very involving drive that needs a fair amount of muscle to throw around. The car was bought sight unseen and has turned out to be in incredibly good shape.
A broken negative battery clamp took a while to track down as the cause of a starting problem this morning, but at least I fixed the dreaded yellow connector while I was at it! I missed any chance of going to the big show in SC though.
When cruising, I thought it had a misfire but after checking the plugs and pulling one lead at a time, I can't find any clues. It has this surging that seems to be coming from the diff rocking, then making the propshaft thrust the gearbox up an down. It's hard to explain, and it isn't very serious, but maybe it rings a bell with someone?
Anyway, must go for another spin - its 75deg out there with not a cloud in sight!
Cheers,
David
Hi David,
Glad you're enjoying your S, but hope there's not going to be a mass migration of our precious few Tivs across the pond now they are becoming a certain age!
As for your drivetrain issue, as well as diff mounts, I'd check gearbox mounting & also propshaft u/j's.
All the best,
Glen
Glad you're enjoying your S, but hope there's not going to be a mass migration of our precious few Tivs across the pond now they are becoming a certain age!
As for your drivetrain issue, as well as diff mounts, I'd check gearbox mounting & also propshaft u/j's.
All the best,
Glen
This should help:
http://www.zeepoort.nl/jetronic/K-Jetronic-trouble...
Especially this part
The Warm-up-Regulator
This is mounted right at the front of the engine with 2 fuel pipes bolted to it, with different size unions and a grey electrical plug. Basically, it is the 'choke'. It provides a richer mixture for cold starting and during the warm up phase. Fuel passes to it from the central union on the metering head. When the engine is cold, the warm up regulator is open, allowing fuel to pass through it. This reduces the pressure acting downwards on the plunger in the metering head, allowing it to lift higher than normal so allowing more fuel to the injectors and giving a richer mixture. As it heats up, by engine temperature and its heating element inside, it closes off slowly causing higher pressure to act on top of the plunger, forcing it down again, so weakening off the mixture. This pressure is called 'control pressure' and again needs the special gauges to check it.
Testing
Behind the larger of the 2 unions is a metal gauze filter. If this gets blocked, it causes the warm up regulator to remain closed, causing very bad flatspots and poor acceleration during the warm up phase, just like trying to drive without using the choke. It can be cleaned out using clean petrol. It also has a vacuum connection to it. This is for full load enrichment. At full load, engine vacuum is low, which opens the valve slightly, reducing the pressure on the control plunger and giving a slightly richer mixture.
http://www.zeepoort.nl/jetronic/K-Jetronic-trouble...
Especially this part
The Warm-up-Regulator
This is mounted right at the front of the engine with 2 fuel pipes bolted to it, with different size unions and a grey electrical plug. Basically, it is the 'choke'. It provides a richer mixture for cold starting and during the warm up phase. Fuel passes to it from the central union on the metering head. When the engine is cold, the warm up regulator is open, allowing fuel to pass through it. This reduces the pressure acting downwards on the plunger in the metering head, allowing it to lift higher than normal so allowing more fuel to the injectors and giving a richer mixture. As it heats up, by engine temperature and its heating element inside, it closes off slowly causing higher pressure to act on top of the plunger, forcing it down again, so weakening off the mixture. This pressure is called 'control pressure' and again needs the special gauges to check it.
Testing
Behind the larger of the 2 unions is a metal gauze filter. If this gets blocked, it causes the warm up regulator to remain closed, causing very bad flatspots and poor acceleration during the warm up phase, just like trying to drive without using the choke. It can be cleaned out using clean petrol. It also has a vacuum connection to it. This is for full load enrichment. At full load, engine vacuum is low, which opens the valve slightly, reducing the pressure on the control plunger and giving a slightly richer mixture.
Hi, and welcome to the fold! I have just purchased an S1 2.8, and I encountered the same problem. I usually drive my Taimar with Essex v6 on carbs, but the fuel injection system feels different with it's long throttle pedal travel, it does not seem so eager to rev, although it does, cleanly with no load, but acceleration between 40-70 in 4th seems "wobbly" not necesarily "missing" I checked for air leaks, and changed the taped up induction pipe with little immediate effect, but, the more I use it, the better it gets!, regretably mostly in 9 degrees, and drizzly! but the effect seems to be "driving out"........
Thanks for the suggestions guys. Last night I worked on every electrical connector that I could find, swapped the fuel pump relay for another used one, checked plumbing everywhere and so on. For 500yds or so it drove perfectly, which made me feel good about the driveline, but then the bucking slowly came back. I disconnected the cold start valve just in case in impulse module was stuck on, but no change. I'm leaning towards a fueling problem since the car was out of fuel when I picked it up. I assume it was running until it ran out, so it could have sucked in some trash. Or my repeated attempts to start it before putting any petrol in may have hurt the pump. I think I will just replace the fuel filter first, then if still no joy, get a fuel pressure gauge and test the pump under load somehow? After reading the info about the warmup regulator, I think I can rule that out for now because the previous owner did not experience this issue. It is most likely related to the gas running out (I think....)
Thanks for the suggestions guys. Last night I worked on every electrical connector that I could find, swapped the fuel pump relay for another used one, checked plumbing everywhere and so on. For 500yds or so it drove perfectly, which made me feel good about the driveline, but then the bucking slowly came back. I disconnected the cold start valve just in case in impulse module was stuck on, but no change. I'm leaning towards a fueling problem since the car was out of fuel when I picked it up. I assume it was running until it ran out, so it could have sucked in some trash. Or my repeated attempts to start it before putting any petrol in may have hurt the pump. I think I will just replace the fuel filter first, then if still no joy, get a fuel pressure gauge and test the pump under load somehow? After reading the info about the warmup regulator, I think I can rule that out for now because the previous owner did not experience this issue. It is most likely related to the gas running out (I think....)
I'm pretty careful with the fuel level myself. This happened while being shipped to the USA. The shipping company requires less than 1/4 tank for transport, and I guess it was left running at some point until it ran out of juice. Funnily enough, the only time I was caught out was in a Prius - the gauge all of a sudden went from 2 blocks to a single flashing block, and then cut out, all within the space of a couple of miles. It couldn't have been further from a petrol station either!
Update: I think the misfire has gone now, at least it feels much better than before. The fuel pump electrical connectors were a bit dodgy, so I crimped them a bit more. The clue was that it made a whining when I turned sharply to the right.
Now, with a smooth engine, I think I have an issue that may just be one of those quirks that come with the car... At about 45-50mph in fourth there is a drumming sound in the cabin, like the air is throbbing, or a tyre has a giant flat spot. Above and below this speed all is smooth. It might not matter which gear I'm in, but 3rd it too loud and it labours in 5th. The most similar thing I have experienced is when the lower engine cover dropped down on my family car and was being buffeted by wind. It seems like it might just be buffeting, but I don't have another car to compare it with.
Oh, and that engine is tappety! I checked valve clearances and they were dead on. Maybe I have a small exhaust leak...
Now, with a smooth engine, I think I have an issue that may just be one of those quirks that come with the car... At about 45-50mph in fourth there is a drumming sound in the cabin, like the air is throbbing, or a tyre has a giant flat spot. Above and below this speed all is smooth. It might not matter which gear I'm in, but 3rd it too loud and it labours in 5th. The most similar thing I have experienced is when the lower engine cover dropped down on my family car and was being buffeted by wind. It seems like it might just be buffeting, but I don't have another car to compare it with.
Oh, and that engine is tappety! I checked valve clearances and they were dead on. Maybe I have a small exhaust leak...
Edited by Loach1 on Wednesday 31st October 01:48
Loach1 said:
Oh, and that engine is tappety! I checked valve clearances and they were dead on. Maybe I have a small exhaust leak...
Mine too but it's been checked all over and given a full clean bill of health.. Also has no effect on feul, performance etc so must just be a nuance of that series!! ;-)Edited by Loach1 on Wednesday 31st October 01:48
Rich
Loach1 said:
At about 45-50mph in fourth there is a drumming sound in the cabin,
Maybe a duff propshaft uj ? That could well cause a drumming or viabration at certain speeds.Or possible an exhaust issue? A dodgey after market or damaged exhaust can cause strange droning noises or resonance
I jumped the gun a bit - the misfire is still there. It was very bad driving back from work yesterday, so I am planning on draining the fuel tank and investigating if it has an internal filter/strainer. While I'm at it I will remove and clean/test the fuel pump.
I have no idea how I am supposed to inspect and clean the inside of the tank. I've seen pictures of a small inspection cover at the bottom, but mine just has a plate welded over the hole. I guess I have to go in via the sender hole, but it looks next to impossible to get a good look in there, let alone fish out any junk.
And luckily (I think), the sender unit is a screw-on type:
Has anyone seen a tank like this? Is it original? I'd like to understand the inner workings before attempting surgery if possible.
Thanks,
David
I have no idea how I am supposed to inspect and clean the inside of the tank. I've seen pictures of a small inspection cover at the bottom, but mine just has a plate welded over the hole. I guess I have to go in via the sender hole, but it looks next to impossible to get a good look in there, let alone fish out any junk.
And luckily (I think), the sender unit is a screw-on type:
Has anyone seen a tank like this? Is it original? I'd like to understand the inner workings before attempting surgery if possible.
Thanks,
David
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