Help...Can CIS (or K Jetronic) systems flood ?

[AUS911SC3]

Dumb question guys.....Can CIS (or K Jetronic) injection systems flood ? Please help..

[oneblueyedog]

With the key on without the engine running, holding the sensor plate up too long will flood the engine.

[T77911S]

CIS can flood if the key is on and the air flow meter (AFM) plate is lifted so the fuel pump runs, unless yours is rewired so it is on all the time. if that is the case, then the plunger in the fuel distributor (FD) is sticking, or the cold start valve (CS) is staying on. you could also have leaky injectors. it could fill the cylinder and cause hydro lock.
maybe a little more info as to why you ask.

[1982911SCTarga]

Let's back up. There are several potential ways to "flood" a CIS engine. The simplest is through excessive cranking with a no-start occurring. That's because the sensor plate is seeing airflow and telling the injectors to open up and do their thing.

Also, as mentioned, issues with the cold start injector (the seventh injector) can result in excessive fuel.

Tell us more about what engine you've got and what exactly you're dealing with.

When I bought my SC cabriolet last fall, the oil was contaminated with fuel, the result of many out-of-tolerance interactions and excessive cranking by the previous owner. There was also oil everwhere (including in the airbox).

Luckily, when I ran the engine for a brief period and during the subsequent teardown, I didn't find any signs of a hydrolock situation, which can bend rods. Tim Hancock found a bent rod when he rebuilt his 3.0 engine, if I recall correctly.

Brian

[Paulporsche]

As Brian said, what problems are you having?

[ossiblue]

AUS911SC3,

What others have posted is absolutely correct. Your question is not "dumb" and, in fact, very crucial as the CIS system is not like most modern FI systems. What many don't realize is that when the sensor plate is lifted--for any reason--all six injectors open at once, fill the intake ports, and await the opening of the valves to deliver the fuel. Thus, if there is no turning of the engine and the sensor plate is raised, all the ports fill (and the one cylinder that has the open intake at the time.) If there is cranking of the engine and no spark, all the cylinders fill with gasoline. Flooding is a very real and potentially destrustive possibility. This is not like an electronic injector system that opens each injector separately, in measured amounts, and designed around electronic signals. CIS in mechanical. Take care.

[James Brown]

not sure what AUS911SC3 is getting at but he could be discribing a "rich" fuel/air mixture. need more info. and yes you can put a lot of fuel in all cylinders real quick if you push up on that plate. but if your starting the car and you pump the throttle prior to starting, you won't flood it-no fuel is flowing with the engine off. (see MANY posts on the CIS system in here).