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Hi everyone, My name's Nishan, since ive been reading through some of the threads I figured id make an introductory post 🙂 Ive got an manual MC1 aerodeck with a D16W4 on 118k that I picked up as an MOT failure about a month ago for £800, its got an enormous stack of history and im the 3rd owner Been fixing her up slowly over the last month, getting the bits done for a fresh MOT, rear passenger caliper was seized when I bought it and was pretty much the first thing I did along with discs and pads both sides on the rear. Next issue to sort was the horn not working which I stupidly assumed was the clockspring since I had the exact same issue on my first car which was a D14 mb6 and I know its a common issue on old civics. Replaced it and ended up buying a used horn since my multimeter packed up so I just guessed it had to be one of the two. Replaced both the sidelight bulbs since they had burnt out and lastly i had an exhaust leak from the mid section and backbox, since someone had previously taken a few speed bumps pretty enthusiastically and put a nice collection of holes on the bottom managed to score the backbox and mid section for £100 on ebay brand new and almost finished fitting it last weekend, just need to drill out the old bolts to the cat that are pretty in there and that should pass me the MOT fingers crossed 😀. Im thinking of doing some coolant bypass bits as I've heard its a good modification on the D series engines. If anyone knows a thread that explains how best to go about it or has done it themselves please let me know, would be much appreciated Im aiming to put it on the road as my daily as I'm currently dailying a manual honda accord CM2 2.2 diesel which has a nasty bit of timing chain rattle, so im gonna switch them around and daily the civic while I replace the timing chain along with any other bits that need doing. Any info in regards to preventative maintenance on the aerodeck would be greatly appreciated as im not super well versed in the common issues these suffer from. Cheers guys 😁

Cheers dude! Checked for vac leaks already and none have came up, used soapy water, as well as the old brake cleaner technique Definitely reckon it’s throttle body related, will dive into it this weekend

A faulty vaccum line or a bad IACV could very well be the reason for all of your problems. Bad vacuum line / IACV -> more air gets into the engine -> lean mixture That explains the slow rev-downs because the extra air works like a stuck throttle and also explains the timing being pulled in higher RPMs due to a lean mixture. Your engine is definitely being fed too much air, and it has to get in there somehow. Now the fun begins - searching for a leak. I'd recommend checking your intake system with (low pressure) pressured air and soapy water that nicely foams up where the air leaks out of your system. I don't envy you, searching for mechanical gremlins is always a s**tty job. Especially on modified cars. Start in the obvious areas, the easiest explanation is often the correct one. And check your gaskets, too! Good luck brother

There sure is a chance...

They all seem to be coming from the same ip address @Dave, but I don't see how I can block it?