i read the FAQ page before posting and did a few things. i still have a problem so i'm posting. i replaced the crank position sensor, the knock sensor, and had the timing adjusted. it runs fine once it gets running. here's the deal. at a dead stop, if you go straight from brake to gas, it lags for sometimes as long as 5 seconds and slowly picks up speed. if you get off the brake and let it roll at idle for about 2 seconds the ease into the gas, there's no problem at all. sometimes it does this and sometimes not. i don't drive it like a racecar, and i don't stomp the gas, but regular pedal-switching seems to be a problem. *EDIT* i think i found it. looks like my radio suppresion relay is all green and nasty. i'm going to replace it whether it helps or not. any thoughts and advice are still welcome.

1992 740 4cyl 2.3L non-turbo gasoline

Sorry: I have a similar "hesitation" with my 91 Base 740. It runs and starts well, but will "hiccup" occasionally as if it is a "mis-fire" or as if "one injector didn't fire", or had no spark only for one time, which causes this interruption...My Volvo mechanics 35 years had him replace: Pre-Pump and filter, Crank position sensor, Suppression relay, installed used distributor assembly, new cap rotor plugs and wires. Also: Fuel pump relay, engine temp sensor, Ignition control unit. Today I took it back and it still does the same "miss occasionally", but runs so smoothly though...He says he no longer knows what to do. I am totally heartbroken at two times having this car in for same costly problems. Any advice would be also received gratefully! Sorry I cannot help you with your own set of issues...

I believe a new AMM may help you, it certainly has remedied my problems for the last few hundred miles! Good Luck, you will get it!

I have a similar issue with my 1991 740 Base.

You describe what sounds like "limp home mode" from a failed AMM. I would swap in my known good spare AMM to see if this solves the problem. Do you have one?
Dan

I would clean up your RSR, contacts, wiring plug, look for solder cracks etc. If a mechanic said he adjusted your timing, I would be asking exactly how he did that. Does it rev up normally in neutral? Or does it just lag in gear?
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i just ordered a new RSR, so that wont be an issue next week. it revs up normally in park, havent tried in neutral, and it just lags in gear. as far as contacts and wiring, it will all be cleaned up before installing the new RSR unit.

Kinda agree with Pageda. When my AMM went south. Rev normally in neutral. Put it in gear, bogged down ete. Check your AMM connector plug. Been know for the female pins to back out or make poor contact.
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