I have a 1990 740 turbo that is bogging when accelerated too much. For instance, I can drive the car at a low rpm and barley press on the gas pedal, if I push the throttle in harder it boggs as if it is not getting fuel or something. Here is what I have changed so far....all my vacume hoses (I think all), distributor, fuel filter, strainer, pump (in tank), fuel regulator, fuel pump relay and radio suppression relay at the same time, and my turbo. The turbo is the only questionable part but I did get it from a legit bbb volvo specialist dismantlers. Everything else brand new. I don't know what else to do and have run out of money and ideas of what to do. Please help if u can thank you.

 

Have you checked the MAF?
Have you checked the Cat?
Is your check engine light on?
Have you done a smoke test to see if you have an air leak somewhere?

I wouldnt just throw parts at it hoping it would fix it, do some diagnostics and go from there.

My guess would be the MAF

 

At first didn't have money for a diagnostics been getting. Parts 1 by 1 but ya I know I agree ..........was desperate tho. Forgot to mention, brand new cat. Been doing research I thinf it very well maybe the maf. Haven't bothered smogging because I thought it wud be no use s3nse it can't even get up to speed. Any way to check to maf by myself?

 

unplug it and see if it still happens, or go to the junkyard a swap it out with another one... should only run you about $10