When I drove my "new" '90 Loyale away from the POs house, I noticed several things. The temp guage seemed dead, the car stuttered when accelerating with part throttle, and it didn't seem real fast, even for an 1800 cc car.

 

My daily driver for several years has been a 4 cylinder Mercedes diesel, 69 rampant horsepower, usually faster than many VW vans... I'm saying that my standard for "fast" is pretty low to start with, and even at that the Soob seemed no screamer.

 

I checked the thermostat, none there. Installed 195 degree Stant, now the needle moves up about cold, goes no further. Replaced the

AC plugs with the proper NGKs, fixed the part throttle stutter, still not very fast, seemed to have flat spots from 3 to 4k RPM, doesn't want to go any faster. Cleaned the temps sensor connector, removed the ECU sensor to test, the wires broke away from the unit as I unscrewed it...

 

Ordered a new one. Hundred dollar part, may be here Monday.

Afraid to try to test the TPS, it's a 200 dollar part..

 

bk

you can test the tps by going from ground to the signal wire with a meter (back probe with key on) this requries a digital voltmeter because it's 5v so test light won't help

 

have a friend slowly apply throttle key on engine off, and the voltage should steadlily and linearly go up or down. I don't remember on loyale's but it should be around 5v at idle and decreasing to 0 as throttle is applied but i could be thinking ej's or just backwards.

 

if your meter dips to 0 or jumps to 5 during the sweep test, in the same "cruising" throttle location, definately replace

 

just fyi, your merc diesel may have had 69hp but tq rating is around 140 which is 50lbs more that the scoob and at hella low rpms.

 

the ea82 is slow as dirt. the dead spot you feel after 4k is probobly flow restriction. I DD an 88gl wagon (same car with spfi) for 2+ years. they're slow.

The exhaust on those cars is shielded almost the entire way back, so the shields could look good but the actual exhaust tube could be crushed, causing a flow restriction. Its a long shot, but worth inspecting.

 

I would imagine that if the thermostat was out of the car for any length of time that there could be a lot of varnish buildup on the valves, suck in some seafoam through a small vacuum line and that should help you out.

 

just fyi, your merc diesel may have had 69hp but tq rating is around 140 which is 50lbs more that the scoob and at hella low rpms.

 

the ea82 is slow as dirt. the dead spot you feel after 4k is probobly flow restriction. I DD an 88gl wagon (same car with spfi) for 2+ years. they're slow.

 

 

That got me interested enough to go look up the actual numbers for an '83 W123 240D. 64hp, 101 ft/lb torque...

And mines an automatic...

 

Don't understand "flow restriction" as used here. You mean possible cat or exhaust plug or damage? Air filter is new.

i mean poor head/intake design. I was thinking merc 300d turbo.

 

give it a proper tune up and go from there.