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Message: <blockquote data-quote="beebs90" data-source="post: 1420367" data-attributes="member: 18969">Hi,So I have finished putting my engine back together with new cams, valves, valve springs and ported and polished heads. got it running and idling ok..... it was all working ok then I stated to lose vac to my air vents and a burning smell. so I got a vac pump and gauge and checked all the lines they are all fine. checked the entire loom for any burning cables and they were all fine. so today I fixed a leaky exhaust from the headers to the downpipe (stripped the threads on old bolts first time round). had it running for abit again and the idle settled but I noticed the drivers side exhaust and mostly cat was getting incredibly hot, a lot more then the passenger side. so much so that it had melted the paint off the underside and started melting the sound proofing and insulation inside. the car still has the EGR valve fitted. good news I found out there's no issues with the loom in the cabin and that I found the burning smell. the bad news I have no idea what's causing the drivers exhaust to get so hot. I have a compression tester on way so will do that in the next few days but is there any ideas out there what could be causing it? both sides of the engine stay at the same temperature and no overheating. the car has not been tuned yet, need to sort the issue before I can take it anywhere to tune it. Thanks guys, really lost on this.</blockquote>