When I give the car about half throttle and just try to speed up smoothly, it isn't smooth the whole way up. It will hesitate every little bit. I use 93octane and have ran some good injector cleaner, but the problem is still there. It is like it is still starving just a litte. Any ideas. Thanks.

 

Jon
Unleaded should be octane 95 in Germany.
Try a run with octane 98 and see what happens.
Take care

 

Sorry Hans, 98octane, I was talking about the US equivilant of 93 octane. Forgot about that.

 

I had a hesitation problem that was traced to the main wire between the distributor cap and the coil. It was routed poorly, and caused intermitent misfiring under acceleration due to shorting with nearby metal (hood maybe). Make sure you route the coil wire straight down off of the dist cap to avoid this problem.

 

you dont comment on what type of car it is, but if it a 951 and has any mods (chip, increased boost, MAF,etc) it sounds like you may have low fuel pressure on the rail. I had a similar problem, and found the orig FP regulator was no longer keeping the FP on the rail high enough. You can kinda check this by *slightly* crimping the fuel return line by hand with some pliers, reving the engine, and seeing if it revs more smoothly, as crimping the return line will increase pressure on the rail. Otherwise, you can install a FP gauge on the rail to check actual pressure. If its a 951, it should be about 2.5 bar at idle.

 

You have to be observant sometimes. Look below at the signature block.

Thanks tom, I'll check that out. That is wild that it is just in acceleration if it is misfiring though...

 

observation is overrated Yea, I had already started typing a response, assuming it was a 951, and I don't think the "view" of the thread shows sig blocks after you click on reply...although maybe it does and I missed it....it was kinda earlier here, I believe.

seriously, though, it sounds like the same prob I had with mine.....check FP, as it is easy, so you can at least rule that out

cheers