Engine: 164 2978cc: Cold start valve

[Lesky]

Hello

So, this past week I've been having some fuel system problems with my 164E. First, I had a broken fuel line just behind the transmission. No biggie. Then, after trying to get the car going for a bit it seemed like the engine was flooding. I also noticed some gas spots on the right wing under the throtte body.

A mechanic has told me that my fuel pressure regulator and cold start valve are faulty. Also, he said that when the engine is getting too much fuel that it goes into a hydrolock.

What exactly is a hydrolock? Also, has anyone replaced a cold start valve before? I feel like it is something I can do on my own.

Thank you in advance

Lesky

[laptoprob]

Originally Posted by Lesky

Hello

So, this past week I've been having some fuel system problems with my 164E. First, I had a broken fuel line just behind the transmission. No biggie. Then, after trying to get the car going for a bit it seemed like the engine was flooding. I also noticed some gas spots on the right wing under the throtte body.

A mechanic has told me that my fuel pressure regulator and cold start valve are faulty. Also, he said that when the engine is getting too much fuel that it goes into a hydrolock.

What exactly is a hydrolock? Also, has anyone replaced a cold start valve before? I feel like it is something I can do on my own.

Thank you in advance

Lesky

The cold start valve is simple. With the 140 series, it is located on top of the inlet manifold, just after the throttle valve. Don't know where to find it on the 164, but it should be similar. I doubt this will be a cause. It is switched by a temperature switch just behind the waterpump and air valve.
The cold start air valve is more likely to fail. This is located on the right hand side of the engine, just behind the water pump. The gizmo with the two thinner rubber air ducts. It is almost unobtainable and expensive. Mine don't do too well I'm afraid. But this only lets more air in, so it is easily compensated
The pressure sensor can fail, but it doesn't happen too often afaik.
Both of my injection engines developed a hot start problem when trying to start on petrol. Don't know the cause yet. Sseems to be something like vapour lock.

Hydrolock looks more serious. Tri Wikipedia, good explanation there

cheers, Rob.

[B20F]

First check the cold start injector, also called cold start valve, on leaks. This could explain the fuel droplets on the inner wing. It's located just in front of the big airintake hose in the inletmanifold. It's connected with a fuelhose and a connector. Remove it when the engine is HOT, so it doesn't get activated as it would do with a cold engine. Remove the fuelhose and connector and take it out. Then reattach the fuelhose and connector, hang the injector in a small glass bottle or jar. Then put the car on contact and see if it leaks fuel, which it shouldn't do. Be VERY carefull, don't let fuel getting on hot spots for obvious reasons!
If that is ok measure the fuel pressure. take a (oil)pressure gauge, connect it to the fuelhose from the cold start injector. Let the engine run, or watch it when the fuelpump is turning when you put the car on contact. The pressure should be 2.3bar iirc for a 164E. You can adjust the pressure with the screw on the pressure regulator. If you can't adjust it renew. Don't think it''s the coldstart airvalve. This only lets more air in the manifold with a cold engine and closes when the engine is hot. This wouldn't cause flooding or hydrolock, a leaking coldstart injector would.
Here's is a link to the Djet fault tracing manual:
http://volvo1800pictures.com/documen...lt_tracing.pdf