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I'm so sorry for posting this again but I think it was lost in the shuffle yesterday morning. Let me add to it that the problem has not cleared up, it only does it after I've driven a hundred miles or more and Sunday was not the first time it has done it. I have replaced the Idle Air Motor just because I had one but there was nothing wrong with the one I took off (it didn't even need cleaning).
So here we go again ***********
I took my 89 244 on a nice long trip over the weekend and it ran well execpt for one little problem. After I had driven 125 miles on Interstate and then exited to a stop at the bottom of the ramp, she didn't want to go. As I accelerated from the stop light she started to surge REALLY bad. The car had ran perfectly on the Interstate and idled perfectly at the stop light. The light turned green, I started to accelerate. Just as I came off idle I hit a HUGE "flat spot" and the enginne almost died. I backed off the throttle and she caught up but the engine lurched into a series of surges as if it was running out of fuel. Next stop light it did the same thing but after it gets past the initial bucking and snorting she levels out and runs fine. I pulled back out onto the Interstate, she came up to speed just fine and I cruised along at 75 mph for another 100 miles with no problems at all until I exited again. We drove about 450 miles total and it only acted up for the first few stops after we had driven for a long while.
I drive this car everyday and it has never done anything like that. As a matter of fact, I drove it to work this morning (24 miles) and it acted normally. My first thought is fuel system. I'm leaning toward the Fuel Pressure Regulator because it does it after it has idled for a little bit (at high vacuum and then the vacuum drops rapidly as you accelerate) and then levels out as the engine comes up to speed and the vacuum starts to climb. Of course I could be wrong.
About 4 months ago I replaced the pre-pump and strainer, the fuel pump and filter, the AMM, the throttle switch and the ECU. All of those parts were required to get it to run after I bought it. I didn't use a Volvo main pump. I bought a Bosch "Universal" replacement pump (a fraction of the price or the Volvo pump). The Bosch looks just like the Volvo pump execpt the mounting is a little different, it had the check valve and everything. The pump sounds normal even when it is acting up.
Am I on the right track or chasing rabbits in the wrong direction??
I value your opinion ---- thank you.
Tony
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Tony Turner 89 Volvo 240DL 257K, 92 Jeep Cherokee 250K, 93 Jeep Grand Cherokee 215K, 1980 Mercedes 240D 360K
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