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RE: ur-Q fuel system
Scott, Steve and Scott,
Thanks so much for the info. I am finally starting to understand how it
works and what I have in my car.
>If you are using the 89 intake manifold along with the complete engine
>you may want to do what ever is necessary to use the entire 89 fuel
>Fuel distributor, injectors, lines, pressure regulator,
>warm up regulator etc. Even the accumulator and fuel pump should likely be
>swapped. As you may know, the cylinder head has an air passage that
>all the injectors to mix the air and fuel. The rubber hose in the middle of
>manifold that goes to the head supplys the air. The dual knock sensor
>have a small plastic restrictor orifice in this hose (for some unknown
>You may be asking for trouble trying to adopt the earlier ur-Q fuel
>its characteristics to the new engine with a different compression
>ratio/intake flow/camshaft characteristics etc.
I am using an 84 5k turbo intake manifold, the 83 TQC throttle body and the
89 cylinder head. Checking into the engine last night, I found the air hose
you are describing near the injector for #3 cylinder. I have never been sure
what this guy is for. There is also one on the head in my old 83 TQC engine.
It is plugged up with a blue cap like the one used on the CO sniff tube. The
intake manifold doesn't have the internal air passage which the later ones
have, which supply the pre-throttle body air to the injector air shroud
So in my case of using the 83 fuel system and non-shrouded injectors, I
just leave this guy capped.
>The 89 fuel system (later) system changed to a higher operating
>system pressure. The injector lines going into the fuel distributor are
>instead of the banjobolts/copper washers used on the earlier 86-88 1/2
>The injector threads are finer and the injectors are designed to open at a
>higher pressure. The injector lines were redesigned to handle the
>higher pressure which is supposed to help the hot start characteristics.
>The Fuel distributor was changed for the different ends on the injector
>as well and it now uses a different pressure regulator (that uses a higher
>pressure) similar to the one used on the non-turbo CIS-E systems. The warm
>regulator is the same part number as one used on the 86-88 1/2 5000TQ.
Upon closer inspection, the 89 fuel lines I have are the flared end ones.
I have also learned about the injector threads being different.
>The 89 system seems to be a bit of a bastard child which has part
>of the newer CIS-E system (pressure regulator) but still uses the older
> cold start valve, the warm up regulator and the frequency valve
>whereas the CIS-E uses the electrical differential pressure regulator
>assembly on the side of the Fuel distributor to accomplish the same
>tasks as the above mentioned parts.
I will keep this in mind.
>I suspect the main problem is mounting the 89 Fuel distributor/air flow
>assembly into the original ur-Q location etc but I don't remember your
The FD should mount up to the 83 TQC air flow meter assembly. I will hold
on the 89 fuel system for now. With all the 83 fuel systems parts and the
shroud inlet plugged, the car should run. I will be monitoring the mixture
the A/F meter and the EGT and watch for leaning out. Hopefully all will play
together. Then given sometime I will dig further into the 89 system upgrade.
I will need the air flapper/meter base, pressure regulator and maybe the
Thanks for the help.
Dave Lawson email@example.com