1990 Volvo 240 - Motor shakes some at idle.

[Raulizle]

Hello MVSers,

I am the owner of a 1990 Volvo 240 wagon with a standard transmission (M47). I became the owner of this vehicle in 2010 and drove it for about a year. I fell in love with the wagon and planned to keep it as long as possible; however, the car stopped working for me and I was not able to repair it. I have very limited knowledge when it comes to car repair. About a month ago I decided to try to repair the wagon. I got it to start and ran very well (one week), with a 1-4-4 trouble code, until I took it to a shop and got its rear main seal replaced. The motor started shaking at idle, more than what I would like.



looks a little different in person and was not running like that before.

I would greatly appreciate any input on how to get my Volvo running like a champ!

Here is a list of everything that I have done before taking it to the shop for rear main seal.

-Extended Flame Trap Hose
-Replace Oil Separator Box
-Replace Timing Belt (with IPD DVD)
-Replace Water Pump
-Replace Camshaft Cover Gasket
-Clean Throttle
-Clean Air Idle Valve
-Clean EGR Valve
-Replace Fuel Pump Relay
-Replaced Flame Trap Kit
-Replace Spark Plug Wires
-Replace Spark Plugs
-Replace Vacuum Lines
-Replace O2 Sensor
-Replaced Fuel Pressure Regulator
-Replaced Fuel Filter
-Replaced Fuel Pump (next to Fuel Filter)
-Replaced Mass Air Flow Sensor

After receiving the wagon back I pulled an ECU form a car at the Pick-A-Part with the 951 ending. Mine has a 556 ending on it, I am assuming the previous owner must have taken that one out of an 89' model.
When I connect the 951 ECU the car seems to be idling with higher RPMs, but I do not have a tachometer in my car, so I can't see by how much. I also disconnected the MAF sensor while the car was on and it seemed to drop the RPMs with it disconnected while still. When I have the 556 ECU connected the RPM's seem to be fine at Idle. With both ECUs motor still shakes as if there was a wrong mixture between air and fuel. When I switched back to the 556 the car seemed to have a little trouble starting at first.

After that I put my old MAF sensor in and no change. Vacuum hoses seem to all be connected. I do not have any holes in my accordion hose. Motor mounts are good. Code 1-4-4 is still on.

Thank you very much.

[lummert]

Diagnostic code 1-4-4 for 1990-1993 240

EZK - Load signal from ECU missing.

[Raulizle]

How would I go about checking the load signal? Where does the signal originate from?

[93Regina]

951 ending. Mine has a 556 ending on it

Code 1-4-4 is still on.

0 280 000-556 - 1989-1990 (EGR)

0 280 000-951 - Good substitute for non-turbo, non-EGR LH2.4 ECU

Table 2: EZK 116 and Regina Rex Ignition Fault Codes - No load signal from fuel injection system - Bad fuel injection relay; faulty wiring from LH to EZK; bad LH module

It would appear using 951 on an EGR based vehicle is out of specification

[93Regina]

How would I go about checking the load signal?

Check fuse terminals for fuel pump; make sure they are clean, and fuse fits good.

I don't recall, does engine run OK above idle? If not, it maybe time to replace CPS (crank position sensor) or power stage on the left inner fender.

[93Regina]

Brake Booster - Its diaphragm may be ruptured, so remove hose from engine side, and cap port. If no change in symptoms, then hook it back up. Then try a new CPS...on ebay, there were some for like $10.00 shipped.

[Raulizle]

Awesome Responses 93REGINA I will most definitely check those out on the wagon and post the results.

I appreciate all of your help!