Quattro Squad

More 85 Sale Prep

In our last update we fixed a boost leak, refurbished the fuel distributor, fixed the seat and announced that the car is going to be sold. 

This week we start prepping it for sale starting with troubleshooting an on boost hesitation we’ve been driving around for some time. It’s hard to interrogate CIS injection as it predate OBD anything so we are just going to benchmark as many systems as we can until we clear it, hopefully. The fuel distributor rebuild was part of that approach and this time we rebuilt the warmup regulator. Well, not exactly. We discovered that our car has the wrong warmup regulator! The type with only one vacuum port on the base and it had been made adjustable. Always a sign of a workaround for something else. So we actually rebuilt the warmup regulator from our 83 rally build instead, which was the original one. You can see them both below.

A close-up view of a mechanical component under a vehicle's hood, likely an engine part with wires and metal tubing connected.
A close-up image of a metallic automotive component, possibly a valve or sensor, placed on a white paper towel. The part features multiple openings and an electrical connector.


Maybe this is the cause of our issue? We ordered a rebuild kit from Salvox and dived in.

A clear container holding automotive parts including a warm-up regulator, springs, gaskets, and a rebuild kit for Bosch components, placed on a Priority Mail service background.
A hand holding a red multimeter probe testing an automotive component, with a digital multimeter displaying a reading of 18.4 volts on a workbench covered with various tools and parts.
An interior view of a carburetor body showing various mechanical components with a background of work bench materials and tools.


It was a little tricky squishing everything back together with all the internal spring forces working against us but we persevered. As you can see, we resisted the temptation to polish it.

A hand holding a mechanical component, possibly a fuel pressure regulator, in a garage with a red car in the background. The car's hood is open, revealing its engine.


Luckily we found the extra missing hoses for this warmup regulator. We’ll tidy up the installation later.

Close-up view of engine components including a fuel injector, wires, and hoses, showcasing the intricate connections within an engine compartment.


Did this fix the on boost hesitation? Not exactly but it helped a bit. Our engine now starts a lot easier and the control pressure and air/fuel ratios are behaving themselves a lot better. In fact we’d say they are spot on. Next we’ll make sure there aren’t any more boost or vacuum leaks in the system, “uninstall” the test equipment and then road test it. Unless someone buys it before then of course :)  Stay tuned.

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