what would cause pig rich @ idle???

Re: what would cause pig rich @ idle??? (scoota)

Wed, 15 Jan 2014 08:23:13 GMT

As above, I just replaced coil, igniter, O2 sensor and banged a new set of plugs in. Runs as normal. Idles at 14.7 goes 10 when I boot it,

asimovy, im still yet to hook up my mspnp, so I dare say yours is just the tune.

Re: what would cause pig rich @ idle??? (Dudeman)

Fri, 10 Jan 2014 03:49:43 GMT

Hmm, not idle though.

Re: what would cause pig rich @ idle??? (asimovy)

Thu, 09 Jan 2014 11:55:12 GMT

No no thanks for letting me drive your car it was brilliant!

On my car I think it was the corrosion on the coil, after i fixed that up its now running at 12-13:1 at idle which is still very rich but I think it must just be the base tune on the mega squirt that needs adjusting.

It's hesitating when I slam my foot to 100% throttle too the afr will drop to about 9:1 for a moment then jumps back to around 11, running fine otherwise though. I am assuming it just needs a tune...though if it sounds like something else was happening let me know please!

Re: what would cause pig rich @ idle??? (kojab)

Thu, 09 Jan 2014 11:25:13 GMT

Just curious did either of you guys with the rich mixture find the cause?

Also Ian thanks again for driving my car and your advice.

Re: what would cause pig rich @ idle??? (asimovy)

Fri, 06 Dec 2013 20:47:59 GMT

I realized that the o2 sensor must be ****ed as the ecu was never getting any signal from it at all, I plugged the aftermarket one into the Megasquirt and it helped slightly the AFR would start at 14-15:1 then drop to 10:1 after 10 seconds or so.

Took the coil out and had a look and the connector to the dizzy was all corroded but resistance was still in spec. I've cleaned it up and put it back in, then tried to ground a spark plug to the intake manifold to see the spark and now the car will not start at all....I can hear the starter solenoid engage but the starter does not move, fuses all good have to troubleshoot it more tomorrow.

Re: what would cause pig rich @ idle??? (scoota)

Thu, 05 Dec 2013 00:06:24 GMT

Whats yours doing??
I have my mspnp sitting here, but i want it running sweet on the stock ecu first, otherwise you end up going in circles..!!
If you can get it running for a bit, maybe log yours and see what's going on..
.mines def the coil, tested and it's way out of spec... go ahead and replace the coil and igniter and a fresh set of plugs as track mr2 suggested, cause I'm sure if ones gone, the other wont be far behind it.

Re: what would cause pig rich @ idle??? (asimovy)

Wed, 04 Dec 2013 22:19:19 GMT

I have what seems to be the exact same issue, I installed my Megasquirt today and it still has the same problem.

Re: what would cause pig rich @ idle??? (track_mr2)

Wed, 04 Dec 2013 08:36:33 GMT

Again like I said earlier I reckon its your ignitor module. Change both your coil and ignitor module, will cost you less then $200 off ebay and all should be good.

Re: what would cause pig rich @ idle??? (scoota)

Tue, 03 Dec 2013 17:33:17 GMT

Ok ill throw a new set in tomorrow and see what happens...
Cpu part number is 89661-17321
Located at Phillip island Vic.
I have a megasquirt pnp sitting here, but want to get my car running right on the stock cpu before I install it.

Re: what would cause pig rich @ idle??? (kojab)

Tue, 03 Dec 2013 16:58:12 GMT

Cleaning spark plugs when they have been badly fouled and flooded with fuel is very difficult. They often just wont clean up and you end up with an engine thats hard to start and continuously back firing making you think some other component has failed.
I would throw a new set in just for a few seconds to confirm all cylinders are firing and then shut down quick so as not to foul the new plugs as well.

Can you give me the part numbers of your computer?

Where in Australia are you?

Re: what would cause pig rich @ idle??? (scoota)

Tue, 03 Dec 2013 16:17:25 GMT

Hi kojab its a gen 2 and that makes sense about a wet plug being a short and not firing. Which could quite possibly be what's happening, it only does run on one cylinder atm, can feel which ones are not firing by touching the exhaust manifold. Number 2 runner is red hot and the others are cold...

I will test your method with the timing light and see what happens...if you go back a couple of posts you will see I posted some pics of the coil to dizzy lead...the end was chewed off, looks to me like it was arcing out in the coil socket which could possibly create a weak spark...I dunno I'm just having a stab in the dark...

Next step is remove plugs clean and dry
them, unplug injectors replace plugs and turn over a few times.... that should hopefully clear the chambers of any unburnt fuel...

EDIT: now it won't even fire on one which is leading me to believe my coil is dying/dead, tried testing the spark against a bolt on the engine and it is a very very weak spark, only just firing one off....even the leads aren't putting out much of a spark and the spark it does fire is erratic and small ....I will test with a multimeter as per the bgb tomorrow and confirm...

Re: what would cause pig rich @ idle??? (kojab)

Tue, 03 Dec 2013 15:30:18 GMT

If the plugs are very black or wet they could be seen by a good coil as a short circuit and the plugs will not fire. Its easy to check to see which plugs are firing when the engine is running by using a timing light on each lead in turn and pull the trigger. If the light flashes the plug is firing. If you find a cylinder not flashing it could be a badly fouled plug.

If you put a new set of plugs in you will probably find it will run on all cylinders until it fouls the plugs again.

Is your engine a Gen 2 or 3?

Re: what would cause pig rich @ idle??? (scoota)

Tue, 03 Dec 2013 14:58:41 GMT

Ok so I'm leaning more towards the coil being shot.... its only running on one cylinder atm, but in saying that all plugs are sparking when I pull them and test. However when its idling on one, I pull the plug leads and no change until I get to cyl 2 which stalls it. It also occasionally fires another cylinder randomly.
So does this sound like a shot coil.???
If it is, may as well upgrade, is this suitable with a tach adapter?? And what else if anything will I need???
http://www.ebay.com.au/itm/MSD-Ignition-Kit-Digital-6AL-Box-Blaster-2-Coil-Universal-Coil-Bracket-/221317160248?pt=Motors_Car_Truck_Parts_Accessories&hash=item338787dd38

Re: what would cause pig rich @ idle??? (scoota)

Tue, 03 Dec 2013 11:51:58 GMT

Oh well that's good to know, was unsure if they should have more meat than that. Cheers for the confirmation.. :)
I added some more pigs of the igniter module lead. As effed as it is, it was still producing a solid spark when I tested it...but will replace immediately..

Re: what would cause pig rich @ idle??? (Mrskylighter)

Tue, 03 Dec 2013 11:31:24 GMT

That cap looks almost brand new to me. Nothing wrong with it.
I've changed one that had no posts left whatsoever. Flush with the plastic :)