Question about Cadillac Eldorado

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My 1984 cadillac eldorado is running too rich

What do I adjust to lean it out?

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1 Answer

Can't adjust anything-- it is fuel injected

May be able to adjust the TPS Sensor, but
I doubt that will be part of the lean codes
or whatever you have

May have to mail the injectors away to be cleaned
& flow tested

Have to check for OBD1 Codes,first

Have to check,test & possibly replace the oxygen sensor

Have to test the CTS -coolant temp sensor, to make sure it goes
into closed loop & you have control over the fuel delivery

Too lean-- is either a RICH condition being corrected by ecm
or a vacuum leak & thus lean condition

Many other items & reasons as well

You will need vehicle experience with OBD1 Systems
& an understanding of the DFI Fuel System on the caddy
to work on it.

You say running too rich,what testing told you that?
Too lean & being driven rich, so that are the codes you see !
Dirty worn out injectors-too rich
Fuel Pressure regulator failed-too rich

There is good video on rebuilding a throttle body on
You Tube Video, you can watch & see about pressure
regulators & injectors on your type system

Check every vacuum hose in the engine compartment FIRST
for vacuum leaks

Do not forget about worn out & partially blocked exhaust converters
& clogged gas filters,not related maybe, but still have to be working

Posted on Mar 29, 2014

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SOURCE: "Service Soon" light

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SOURCE: Could you show a spark plug wire diagram 1984

This should be a a HT-4100 engines. Distributor rotation is counter-clockwise. The driver bank is 1-3-5-7. The passenger bank is 2-4-6-8 from the front of the car. The firing order is 1-8-4-3-6-5-7-2. Just like a small block chevrolet

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