H22a running rich,

bb4life · Post by **bb4life** » Mon Feb 11, 2013 7:14 pm

Hi all, ive got a '94 bb4 jdm prelude, today i took it for its mot after its been standing a while and it failed on the emmissions due to running rich, its just had an oil change, filter, fuel filter, new cambelt, manual tensioner conversion, air filter, its also got a custom made 4 branch manifold, and down pipe, i have also cleaned the egr valve out, although not the ports, can anyone point me to what it could be? Also between 2000-4000 rpm it bogs slightly, it seems that alot of h22's have this problem, but any advice would be fantastic! Many thanks!

Post by **4thgenphil** » Mon Feb 11, 2013 7:17 pm

does it have a cat?

Dbo · Post by **Dbo** » Mon Feb 11, 2013 7:26 pm

don't know about the bogging but please tell me that when you changed the cambelt you also done the waterpump

if not watch it carefully

they don't like being messed with and go in about a month if not done.

bb4life · Post by **bb4life** » Mon Feb 11, 2013 7:37 pm

Hi, it does have a cat, and the waterpump was done, thanks for the help guys

Post by **Pushki** » Mon Feb 11, 2013 7:41 pm

O2 sensor?

Post by **4thgenphil** » Mon Feb 11, 2013 7:50 pm

Pushki wrote:O2 sensor?

my first thoughts TBH

vti2003 · Post by **vti2003** » Mon Feb 11, 2013 7:52 pm

Not sure about the running rich bit - could be o2 sensor - but the bogging seems to be a common problem with no single solution.

I finally solved mine 90% by swapping the TPS - you can check if it is that by unplugging it and driving the car. You will get a Engine Light come on if you do. If the car drives loads better then that could be the problem.

The other issue I had that finally solved the problem was HT Leads. I changed mine twice and it ran badly, first were blueprint leads second were from Euro Car Parts - can't remember the name.

I was never happy with them - they didn't seem to click over the plugs properly. Even after adjusting them.

Having tried the motor factor ones and found they were rubbish I had a look on Ebay . I spoke to a guy selling some on ebay locally to me and he assured me if I wasn't happy he would refund me. It was these. http://www.ebay.co.uk/itm/8MM-RED-SILIC ... 5d3918fa2c

Fitted them and they clicked on properly and firmly and the difference was like night and day. Runs perfectly now.

Even sounds better (a LOT better

)

And no - I honestly don't know the seller

I have also cleaned out the EGR system, cleaned and refitted or changed most sensors around the engine done valve clearances etc etc. It all seems to add up a bit at a time to a car that runs great now. The biggest difference was 100% the TPS followed by the leads. I came to the conclusion the TPS was reading right on the multimeter when checked manually but during operation had a worn part that was giving dodgy readings.

Dbo · Post by **Dbo** » Mon Feb 11, 2013 8:02 pm

seems a bit dumb but why the cat? on a 94 BB4 you don't have to have a cat (i think) free's up the engine alot

and in a non cat mot emmisions not a problem

you pay the extra on the insurance for a JDM might as well use all the stuff the UKDM's cant have

bb4life · Post by **bb4life** » Mon Feb 11, 2013 8:07 pm

Yea i will remove the cat im just waiting for the de cat to appear with the ss exhaust system

bristol_bb4 · Post by **bristol_bb4** » Mon Feb 11, 2013 8:43 pm

I can honestly say I didn't notice any difference at all after putting my cat back on for the mot and I've got a full fujitsubo system

Turbo cars benefit for sure but n\a's mmmmmm not do much I don't think