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post #1 of 2 (permalink) Old 02-08-2017, 01:20 PM Thread Starter
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Montreal Spica

Hi, I am novice with Montreal and Spica also. My problem is: sound of the engine is really odd, left exhaust produces black warm smoke, the new spark plugs are also black. The other side produces white cold smoke, during higher rpm there is also black smoke sometimes. The new spark plugs are cleaner and wet from petrol. During higher rpm the Aliment. light starts lighting.
When I open a oil reservoir, the oil is wery runny and it smell after petrol and the oil rapidly increasing in the reservoir when engine runs. I bought all new filters. Do you think it is because of the old filters?
When I bought it, the cut-off solenoid was not connected and the thin tube from oil separator was blocked. Everything looks in good condition by first look. I want to minimize the potentional problem in Spica. What should I try more to do?
Thank you for every answer!
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post #2 of 2 (permalink) Old 02-09-2017, 07:23 AM
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Hi Jan -
White smoke -
a. This can be caused by coolant (water) getting into a cylinder through a broken head gasket.
b. It could also be leaking brake fluid out of the master brake cylinder in the brake booster being sucked into the intake through the vacuum line during deceleration. That smoke is usually very dense and obvious. Check your brake fluid level.

Dark smoke - Could be burning oil or very rich mixture.
With a Spica system, the Thermostatic Actuator acts like a "choke" in a carb system. It richens the mixture while the engine coolant is below 175F/80C. Worn Thermostatic Actuators (T/A) loose the hydraulic fluid in the capillary tube and will not lean out the mixture to normal running, thus stay rich even when the engine is at normal running temperature.

Gasoline smell in the engine oil - This is an indication of a very worn Spica injection pumps. Being a mechanical injection system, there are little cylinders and pistons in the injection pump. When these become worn, fuel leaks into the bottom of the injection pump and then into the main engine sump. There is no cure for that other than an overhaul of the injection pumps. There are also parts in the Logic Section (mechanical computer fuel metering section) Fortunately, Ingram Enterprises here in the U.S. still overhauls these pumps and they are very, very good at it. It's not inexpensive, however. Overhauling and calibrating these pumps is extremely time consuming and takes very specialized equipment. Current cost to overhaul the Montreal injection pump system is $2075 and $400 for the Thermostatic Actuator (T/A).

Ingram Enterprises, Inc. || Home Page

Also, since the Montreal is such a rare car, Wes cannot keep Montreal injection pumps in stock, so you will likely have to ship YOUR pump and T/A to him for overhaul. Given his workload, I would recommend that once you determine that your pump is indeed bad, you email him to see when he can do the work.

If you would like some technical/factory material on the Spica Injection System, send me a private message (PM) in this forum. Include an email address capable of receiving some large files.

It would also be very helpful if you would take some pictures of the injection pumps, Thermostatic Actuator and it's little tube, and the main fuel supply pumps.

Regarding the fuel low pressure light, that usually caused by clogged filters (very dirty fuel tank?) or just failing main supply pumps. A picture of those pumps will tell me if they are originals or not. If they are, it's almost certain that they are worn out and bad.

Recommend that this post be moved to the Fuel Injection System or the Montreal Topic section.

John Stewart
74 Spider
91 164S

Last edited by Roadtrip; 02-09-2017 at 07:26 AM.
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