Stilo
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Post by Stilo on Aug 3, 2014 20:40:41 GMT 1
I've had a Cav 1.7TD and a Corsa 1.5TD. I had a noise / smoke problem with the Corsa that was caused by a leaking injector. On those ones, there were two holes in the injector body: the primary nozzle at the tip did all the running, and then there's a secondary side nozzle that was used just for start up. The body of the injector had a finger on it that lined up with a pointer on the block to ensure the secondary nozzle was pointing the right way. What happened with the Corsa was that this secondary nozzle was leaking slightly under pressure and was causing excess noise, smoke and roughness. I'm wondering if yours could have a similar fault? I don't know if the Corsa injectors work the same way as the ones in the Cav.... One test that might confirm this is if you run the car to around 50mph in third gear and then lift off. If it smokes noticeably on the overrun then this might be your cause...
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Post by lincspoacher on Aug 3, 2014 21:14:54 GMT 1
Isuzu 1.7 &1.5 diesels as fitted to Vauxhalls, the injectors on both engine types have marks that must be lined up when fitting or you will have all manner of running problems.
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Deleted
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Post by Deleted on Aug 3, 2014 21:19:24 GMT 1
I've had a Cav 1.7TD and a Corsa 1.5TD. I had a noise / smoke problem with the Corsa that was caused by a leaking injector. On those ones, there were two holes in the injector body: the primary nozzle at the tip did all the running, and then there's a secondary side nozzle that was used just for start up. The body of the injector had a finger on it that lined up with a pointer on the block to ensure the secondary nozzle was pointing the right way. What happened with the Corsa was that this secondary nozzle was leaking slightly under pressure and was causing excess noise, smoke and roughness. I'm wondering if yours could have a similar fault? I don't know if the Corsa injectors work the same way as the ones in the Cav.... One test that might confirm this is if you run the car to around 50mph in third gear and then lift off. If it smokes noticeably on the overrun then this might be your cause... 2 jet Pintaux. I've been reading up on them today They are bound to be fudged with the mileage on them. It could do with a long run on the motorway really, it's used mostly local journeys. Might get a mate to drive it and me follow, see what's coming out the back end. Not a lot of info on them on the net. Got no idea how much injector recon is. The cars been so good I've never had to mess with it much. I'll have to do some bargain hunting around the scrap yards
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Stilo
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Post by Stilo on Aug 5, 2014 14:18:31 GMT 1
A local injector specialist here told me all about those injector nozzles. He said most other injectors would clean up fine, but those particular ones they never bothered cleaning them and just fitted new nozzles and set the opening pressures. For that reason, you may be better off stumping up for new nozzles, particularly if the car is otherwise as good as it is. Going the scrappie route could create more problems than are solved. Oh, and if pulling the injectors out, be very careful with the spill rail as they snap very easily.
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Deleted
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Post by Deleted on Aug 5, 2014 18:50:32 GMT 1
A local injector specialist here told me all about those injector nozzles. He said most other injectors would clean up fine, but those particular ones they never bothered cleaning them and just fitted new nozzles and set the opening pressures. For that reason, you may be better off stumping up for new nozzles, particularly if the car is otherwise as good as it is. Going the scrappie route could create more problems than are solved. Oh, and if pulling the injectors out, be very careful with the spill rail as they snap very easily. Thanks Lee. I'll Compression test it first before I do anything else, something doesn't seem right somewhere. Although it's smoothed out a bit and seems more responsive low down it feels a bit gutless. Plant my foot down in 4th and it's not how it used to be. Still boosting but hanging back. Turned the fuel up a bit and that's a pain in the ass with the screw on the back. Just ended up pumping black out so turned it down a tad until the smoke stopped, seems a bit better but not right. Compression test and I'll take all the pipe work off when I get chance to check the turbo. Busy with other stuff too at the moment, always the way when things go tits up
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Stilo
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Post by Stilo on Aug 6, 2014 9:56:17 GMT 1
A local injector specialist here told me all about those injector nozzles. He said most other injectors would clean up fine, but those particular ones they never bothered cleaning them and just fitted new nozzles and set the opening pressures. For that reason, you may be better off stumping up for new nozzles, particularly if the car is otherwise as good as it is. Going the scrappie route could create more problems than are solved. Oh, and if pulling the injectors out, be very careful with the spill rail as they snap very easily. Thanks Lee. I'll Compression test it first before I do anything else, something doesn't seem right somewhere. Although it's smoothed out a bit and seems more responsive low down it feels a bit gutless. Plant my foot down in 4th and it's not how it used to be. Still boosting but hanging back. Turned the fuel up a bit and that's a pain in the ass with the screw on the back. Just ended up pumping black out so turned it down a tad until the smoke stopped, seems a bit better but not right. Compression test and I'll take all the pipe work off when I get chance to check the turbo. Busy with other stuff too at the moment, always the way when things go tits up If you're going to do a compression test, will that mean you are pulling the injectors out anyway? If so, you might as well get them tested as well as doing the compression test? Or do you compression test through the glow plug port? (am pleading ignorance now!!)
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Post by Karl on Aug 6, 2014 10:16:36 GMT 1
Test via glow worm holes
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Stilo
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Post by Stilo on Aug 6, 2014 12:03:01 GMT 1
As I said, ignorance has been pleaded...
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Deleted
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Post by Deleted on Aug 6, 2014 16:38:16 GMT 1
The glow hole Funny driving it today she has her punch back, must have been my last fuel tweak yesterday Sat in car waiting for the mrs for 45 mins and it cools down. Start it up without touching accelerator she's idling at about 550/600rpm rough, rev it and it's missing on one cylinder until it clears after a few revs then she's idling properly. I'm waiting to borrow a gauge so either this weekend or next weekend I'll post up the results. Do you have to remove all the glow plugs or just cylinder by cylinder? Obviously disconnect the stop solenoid and that's it isn't it? Cold engine?
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Stilo
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Post by Stilo on Aug 7, 2014 13:57:10 GMT 1
The glow hole Funny driving it today she has her punch back, must have been my last fuel tweak yesterday Sat in car waiting for the mrs for 45 mins and it cools down. Start it up without touching accelerator she's idling at about 550/600rpm rough, rev it and it's missing on one cylinder until it clears after a few revs then she's idling properly. That sounds more like an air leak / fuel supply fault.
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Deleted
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Post by Deleted on Aug 7, 2014 15:53:31 GMT 1
I've got it set just right now, no smoke of any concern. Kept up with a new astra 1.7cdt thingy and some sporty looking honda going up the A4060 up to the heads of the valley and that's a steep climb. I could see look of horror on the chaved up honda drivers face because he couldn't pull away from me. I'm hoping compressions to be ok and it just needs new injectors for the rough idle. We shall see. Seems better on fuel as well since replacing just the two shims.
When I first bought it, it was great on the motorway but no get up and go around town. I took the tamper proof cap off the fuel screw and gave it 15° turn clockwise to increase it and it's been like that ever since. Just made it more eager pulling away etc. It's a fine line though, a bit too much either way makes a lot of difference. No idea how they set these up at the factory. I had 3 mondeo 1.8td estates and they were all different performance wise even though they had the same engines.
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Deleted
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Post by Deleted on Aug 14, 2014 20:04:01 GMT 1
Had another quick look at this yesterday. Still not done a compression test as the one I borrowed had the glow plug adapter I needed damaged Anyway I took all the intake pipework off. Very slight play in the turbo shaft, same as last time I checked it. Small amount of oil in intake piping, the same as usual. Ran the engine up with the pipework off. I was stood there while it was idling and almost put the palm of my hand over the inlet pipe which has a hell of a lot of suction but caught myself before my hand got sucked in. What I noticed was plenty of suction while idling and revving up but when letting off the accelerator air was being blown out! Surly this means stuffed inlet valves/seats? I know diesels don't have a throttle but it shouldn't be blowing air out should it? What I can't understand is how this thing starts up first turn of the key in the morning and almost straight away when hot, still goes very well (boosts up on the gauge fine) it'll pull over a ton in no time at all and is back up to 50 mpg or there abouts if the engine is shagged out as much as I think it is Looks like the head will be coming off after all because I'm curious now as to what kind of state it's in. Trouble with me is I'll end up checking the bores, if the bores look ok I'll want to pop the pistons and check the rings, ring gaps etc. I'll still do a compression test but I'm in two minds. If the car was a lump of rot I'd just scrap it but it only needs half a sill. Not worth doing the sill or any other work if the engine is shot lol
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Post by upkeep on Aug 14, 2014 20:51:40 GMT 1
Why are you doing a compression test when in the first line of the first post to mention that the valve clearances need adjusting.
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Post by chippie on Aug 14, 2014 20:57:23 GMT 1
you answered your own question.....
its a turbo driven air intake...
the turbo is driven by the exhaust gases yeah.....it blows the air drawn in from the air filter into the cylinders via the inlet manifold if the valves are shut, where does that blown air go?
again do a compression test, it will tell you how good the pistons/ rings and valves are sealing...
engine fundamentals.....!
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Deleted
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Post by Deleted on Aug 14, 2014 21:23:37 GMT 1
Has it ever had any work on the valve and pump timing ? has the pump ever been moved and not clocked with a dti ?
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