Hi guys,

I'm wondering if anyone has experienced a similar issue?

Done the wasted spark/closed loop conversion

The car will not go into closed loop at idle, has anyone else had this?

I'm running an independant bosch closed loop lambda sensor (not an output from a wideband)

The TPS is set correctly (0.25° at closed throttle via IAW monitor)
The base idle is set correctly (900-1000rpm with ISCV unplugged, coolant temp of 88°C)
The CO screw has been reset and adjusted but makes small difference

It idles at about 12.8:1 AFR. When I put the lights on, and the fans cut in, it leans off to about 14ish, but I'm going to do this, then unplug the lambda sensor, to see if it IS in closed loop at this state or not

The closed loop works everywhere, when driving, that it is supposed to, from what I've seen so far

The only thing I can think of, is that maybe the fueling in the map, is over 40% out at idle, and the closed loop can't correct it enough


Any ideas are more than welcome

 

I think the tps needs to be set at -0.30 this is what I was told to set mine at for closed throttle, also the idle should be 850-900 with no iscv when hot, if it goes over 1000rpm it comes out of the idle stratergy.
The co screw should be between -25/+25%
if it's all at these settings and it's still not working then either the map is too rich at idle, the cam timing isn't set to the recomended figures, or you have an inlet leak.

If your 100% happy with everything else then Msd will do a new chip with less fuel on idle for you.

 

I saw a htread last week where James @MSD said he sets the throttle to 0.2° when closed, unless I read it wrong

Idle was 900-950rpm with ISCV unplugged

Tried everything with the CO screw

Cam timing is all spot on, was before and its never been changed

I'm open to any suggestions as I'd love to get it working properly!

 

https://passionford.com/forum/genera...o-at-idle.html

in there James says tps being set at 0.07 is ok but you can go down to -0.30 if you have a high co, as long as it goes over 80% flat out.
I'd at least try it, also do a pressure test of the inlet system, ud be surprised at what leaks you may find.

 

James,

Does the car control the idle properly with the ISCV ??

To test this,

Put your foot on the brake in first gear and without touching the throttle, raise the clutch very very slowly to the biting point.
You should feel the engine apply more load to maintain the idle speed.

If that works ok, allow the car to idle once up to temperature and unplug the TPS and observe the idle CO for a few minutes.

If all seems ok, unplug 1 injector while running (anyone) for about 20 seconds then plug it back in and observe the CO over a period of about 2 minutes and see if it corrects.
(We are applying a disturbance in order to get the closed loop to work hard)

Otherwise, if all looks ok, your fuel pressure may be a bit high or you have a vacuum hose to regulator leak possibly.

The lambda sensor may be faulty but can only be tested with an osciloscope properly.

 

when the TPS was set below 0.07% it took 5-6seconds for the car to fire and start.

Unfortunatly my IAW doesnt work when the car is running

 

Stu,

Says he here aims for .20 closed and over 80 at WOT. Mine is 0.25 closed and 82.2 WOT

https://passionford.com/forum/techni...cv-issues.html

Cheers Simon, will try all that!

 

My car takes a while to start, never thought the tps would have anything to do with it. Might b worth looking into.

 

Yep, as Alex says, it took a good 5-6s of cranking to start, but was slightly better when we set the TPS to 0.2

 

Best thing to do is get it working as best as you/I can then get it given the once over by a real pro.

 

I don't really fancy a trip to Blackpool to be honest. And we have all the equipment (IAW if it works with a new lead), so should be able to do all MSD can with their help

 

Yea me to lol and I'm in Croydon so not far from u either. I'm gettin mine setup at Reyland, takin my iaw with me to.
There's only so much you can do with tools and settings that 'should' work the rest is down to experience and knowing what you can get away with.

 

Yea me to lol and I'm in Croydon so not far from u either. I'm gettin mine setup at Reyland, takin my iaw with me to.
There's only so much you can do with tools and settings that 'should' work the rest is down to experience and knowing what you can get away with.

 

I didn't realise you were so close mate!

Hopefully its an easy fix for both of us

 

Yea not too far, we go gokartin in Crawley quite a bit, and my birds mum and dad live in forest row so I'm round ur neck of the woods quite often, never in the 5 tho lol

yea hopefully it's an easy fix, mines workin fine but doesn't means it's at it's best lol

 

Yeah the crawley go karting is meant to be quite good, not been yet myself though!

for any more ideas

 

You phone'd stu or james yet m8 ? surely one of them would be happy to help you out ?

 

that would be to easy

 

Lol if he's anything like me he won't wanna bother busy people with a silly little question, plus it's nice to have it written down somewhere that you can always go back to.

 

Yes, I am in email contact with Stu, which I find easier, as I tend to forget to mention things over the phone. I've sent Stu 3 datalogs from last night, which he requested, so hopefully that will show something up


Exactly Stu, plus the fact, people tend to remember things that happen to their own car, (if they've had similar problems) very well! AND it may help others in the future once I get this sorted

 

the new go karting place is really good

good luck in getting it sorted, hopefully the info you gathered last night will highlight an issue

 

Will be great if it does Terry!

 

The kartin place is the nuts, only 6 months old, is wicked when they open all 3 floors up.
Were goin next Friday.

 

you got any further James ?

 

so close yet so far lol, u still got that soft top 5 stu?!


James, if u want to try it all in my car ur welcome too!!! but u wont get it back after sorry

 

yes m8, in my back garden awaiting some love.

 

Stu that must be fookin NUTS!

I'm hopefully being sent a chip today with less fuel at idle, as I think it is in closed loop, just can't correct it enough...it goes to 10:1 with lambda unplugged


Tony, nice try

 

Msd are good like that, did the same for me.


Yes m8 it's wicked fun, 200 bhp/trq, roof down system up cruising car.
I'm a bit old for it now tho and get embarressed by the attention it gets, lol

I'm gunna restore it back to it's former glory by putting a STD bodykit back on it.
I might even put it back on the road for summer this year.