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5th August 2018, 21:41 | #1 |
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ZT 160 turbo help needed please
Hi all.
I've had my 160 a month now and I'm in need of a little advice. When I bought it (cheap), it had a bit of a coolant leak, which I assumed was the head gasket. On advice I changed the inlet manifold gasket, which stopped the leak. However, before the gasket arrived, the engine developed a misfire and then hydro locked. When I changed the inlet gasket I also changed the spark plugs, and the misfire went away. I took the car to Silverstone (700 mile round trip) for the British Grand Prix. The car got there lovely, but while I was there I ran the engine for a few hours to charge my phone and the short top hose burst. AA fixed it and I drove it home. As I drove home, I noticed the misfire was back. When I got home I cleaned the plugs and shone a torch into each cylinder. All looked well, but to be honest I didn't really know what I was looking for. Since then I have changed both coil packs and both HT leads. Running is less lumpy, but still not right. Here's where I need the advice. Could the hydro locking have bent a valve stem? I can't hear any tappetty sort of sounds; there's just a stutter on acceleration and a bit of lumpiness at low revs. The only other thing I can think of, if not a valve stem, is a damaged injector. So, before I spend out on new injectors or take the head off, I'd like to hear your thoughts on what I should be looking at. Thanks in advance. Martin Sent from my Pixel 2 XL using Tapatalk |
6th August 2018, 09:49 | #2 | ||
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Quote:
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The hose burst because the engine overheated. Did the radiator cooling fan not operate? It should have tripped on at 105C or so, before the hose burst. I suspect the loss of slow speed cooling has exacerbated the problems with the cooling system. Can you run the Demist Test? TC |
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6th August 2018, 10:00 | #3 |
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Thanks. Cooling fan seems just fine. I think it's undeniable that running the engine for a couple of hours in 32C sunshine was a mistake. I'd only had the car a week and wasn't sure of the condition of the battery.
I'm sure I've damaged something, and I'm sure I can repair whatever it is. I just don't know enough to find out what the damage is. Sent from my Pixel 2 XL using Tapatalk |
6th August 2018, 10:18 | #4 |
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What gap have you got on the plugs? 1.8Ts run best with the gap reduced to 0.6 - 0.7mm not the recommended 1mm.
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6th August 2018, 11:25 | #5 |
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Try a replacement boost solenoid first.
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6th August 2018, 11:34 | #6 |
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Sorry, I have to ask, what are the circumstances around the "hydrolocking"?
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6th August 2018, 11:44 | #7 |
I really should get out more.......
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Hydrolocking is as i undertand the term when an engine either seizes or suffers catastrophic failure due to the ingress of a substantial volume of water in the cylinders. I can only imagine the OP has done this if they have gone through a flood/pool and the air intake has taken onboard a substantial amount of water.
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6th August 2018, 12:28 | #8 | |
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6th August 2018, 12:46 | #9 |
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6th August 2018, 12:58 | #10 | |
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This is only something I became aware of afterwards, so at the time I did exactly the wrong thing and kept trying until it finally cranked over and started. That's why I was concerned about a bent valve stem: turning the engine over with an incompressible fluid in the combustion chamber, with nowhere to go, but out past a valve stem. Sent from my Pixel 2 XL using Tapatalk |
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