# E36 IAC? **URL:** \ **Category:** Shift518 Automotive\ **Created:** [March 4, 2013, 2:08pm UTC](https://forums.speedlife.net/t/e36-iac/266379 "2013-03-04T14:08:29Z")\ **Posts on this page:** 1\ **Showing post:** 39
**Author:** ![CJRando](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/cjrando/32/6369_2.png) [@CJRando](https://forums.speedlife.net/u/CJRando)\ **Post date:** [March 17, 2013, 1:08pm UTC](https://forums.speedlife.net/t/e36-iac/266379/39 "2013-03-17T13:08:47Z")
> [@s2000\>GTI](https://forums.speedlife.net/t/s2000-gti/51995/21): > > Yeah that doesn’t really happen with these cars, the cats are awesome, set well away from the motor, and there’s not much that can plug them upstream. > > does it sound like its straining or does it just hit a hard wall at a specific rpm (like a limiter) The fuel pressure checked out. IN 1st gear the car revs up, but then it strains to build rpms, once it hits 4k, its like hitting a brick wall in any gear. I checked the new MAF, and its a cheap ebay one, so I’m going to go see BMW Joe tomorrow and swap one out and see if thats the issue. I replaced every vacuum line, to include the small on on the FPR, IAC hose, the elbow, CCV, and the IAC. I also reconnected the vacuum, under the fuse box, to the T fitting and replaced the canister just to be on the safe side for now. If I disconnect the MAF the idle will stumble a bit, but then no difference. If this is not the issue, I’ll probably take it and get the cat checked. I’ve only sunk $150 in misc parts so far, most of which is stuff which should be replaced reguardless of this issue. Adam-- thanks for the info on the fuel pressure! --- _[View the full topic](https://forums.speedlife.net/t/e36-iac/266379)._