prime start 225TLRS

[mygrady1]

would someone explain to me, in layman's terms, how to test the PS solenoids. Both the solenoids and the incoming leads to the solenoids. I know this is a silly question to some techs but a lot of us asking questions do not have working knowledge of how to test.
Rodbolt: She might be an antique but she's all I have and I am trying to protect her.

[mygrady1]

OK, let me ask a follow up question.
I have voltage to my solenoids, both A&B. What resistance am I looking for on the solenoids or is this a proper check for the solenoids. I can not find this info anywhere.

[boscoe99]

Resistance values are not shown in the service manual. The procedure shown in the SM to check the solenoids is as follows:

[boscoe99]

Since you have an enquiring mind, here is the theory of operation

Prime Start Enrichment
Additional fuel enrichment is necessary to start a cold engine. Fuel-air mixes do not want to vaporize readily in a cold engine. In order to get the fuel to vaporize, additional quantities of fuel is dumped into the engine.
On most V4 and V6 engines, a choke plate is used for cold starts. This plate restricts air entering the engine and increases the fuel-air ratio.
The enrichment system on the 90° 225HP engines (1990 - 1995) is con*****ed by a microprocessor.
The choke switch and choke valve system have been eliminated. Temperature and throttle position are monitored and enrichment is automatic. An electromagnetic valve unit with a pair of injectors with different diameters are used to provide enrichment. Timing advance is also con*****ed by the microprocessor, thus eliminating the need to advance the throttle during startup.

Initial Fuel Enrichment
Enriching fuel is provided to the engine by either one or both electromagnetic valves. Fuel is drawn from the float chamber of the #1 carburetor
by an enriching fuel feed pump built into the electromagnetic valve unit. The fuel pump is powered by alternating pressures from the crankcase that supplies fuel to the two electromagnetic valves, “A” and “B.” The fuel is then distributed to the intake manifold through three delivery hoses.
A thermosensor mounted on one of the cylinder heads detects engine temperature and provides a signal to the microcomputer. The electromagnetic or fuel enrichment valves are turned on at the moment the starter relay is turned on by the microcomputer. The function ceases when the key switch is returned to the “run” or “off” position. One or both of the electromagnetic valves, “A” and “B,” are opened to pass enriching fuel according to engine temperature.
There are two orifice sizes in the valve unit with valve “A” having the largest at 1.4mm and valve “B” with a 1.0mm orifice.
There are four levels of enrichment according to temperature. Maximum output will be at 50°F or less with both valves open with two other stages of enriching as shown in the chart. When the engine reaches a temperature of 109°F or
greater or the starter relay is off, enriching will no longer occur.

[rodbolt17]

actually, enrichment may occur based on TPS and knock sensor feed backs.

when the USN medically retired me that engine was almost new.