Car D.I.Y.

[Deleted member 26715]

For those who may have some pearls of wisdom.

Things I have done yesterday & today.

Removed the air temp sender, connected to multimeter, warmed it up with a hairdryer the resistance changed, tried the air temp sender in front of the MAF where it is as stock & also after MAF where I am running it, the readings were consistent in both positions with the engine running.
MAF, ran the engine at 1k, 1.5k, 2k, 2,5k & 3k & took the voltage at each step, plotted them on a graph & got an almost perfect straight line, which should indicate it's working as expected.
TPS, connected multimeter & then as the TPS was opened it was a steady increase in resistance & decrease as it was closed, tapping it gently at any given point doesn't make any difference.
Water temperature sender, as the water got hotter the voltage decreased, if the connector is removed the engine note changes & switches on the fan if the engine gets hot is also switches on the fan.
Fitted a new Lambda, even though I'm convinced there was nothing wrong with the last one, checked the wiring multiple times, I'm sure it's wired correctly
I've also continuity tested all the wires from the senders back to the ECU, I am now at my wits end, I have no further thoughts, I'm going to see the guy to who I've taken my carburettor cars to , he has a dyno etc. he works on programmable ECU's but as this is a sealed ECU I'm not sure he will be able to do anything.

 

[Drago]

How badly out is the CO?

 

[midlife]

Most modern ECU's can be remapped so hopefully mapper can sort out the emissions

 

[Deleted member 26715]

How badly out is the CO?

Needs be be less than 0.3, currently no matter what I appear to be it's 0.7

Most modern ECU's can be remapped so hopefully mapper can sort out the emissions

It's 1998, so not exactly modern, it's not even OBD compatible but the tuner races & works on MX5's so I'm hoping he may have some test equipment.

 

[midlife]

Ah! My old 400 odd BHP methanol injected Impreza from 2001 had a mappable DENSO Ecu. Before that it was the black art of motherboards or replacing the Ecu!, presumably the AFR is way off stoic if so much Co?

 

[Bazzer]

Any air leaks?

 

[Deleted member 26715]

Any air leaks?

Not that I can hear/find, I would expect to see some evidence of sooty deposit

 

[Drago]

What exhaust is it running? Is the design allowing sufficient scavenging?

 

[Deleted member 26715]

Others running the same setup don't have problems

 

[Bazzer]

Others running the same setup don't have problems

Cat converter f*****d? Would a cleaner help?

Not DIY, but found Mrs B's Tiguan wishbone bushes were wrecked. - Not an ideal discovery when braking on a dual carriageway.😳 The car is on a 64 plate FFS!
Anyway, having fought track rod end bushes on my Stag it was off to the local garage. £245 notes later, I was quite glad I hadn't attempted it, as even he said they were a bastard to fit.

Meanwhile in Triumph world, I am hoping to collect 2 cylinder heads this weekend. I should have picked them up last last Saturday, but I unexpectedly needed to be home to support Mrs B and child 2.

 

[Deleted member 26715]

Brand new Cat but suspect that's the issue ordered a type approved one now 3 times the cost but if it works then it's worth it

 

[Scottish Scrutineer]

Brand new Cat but suspect that's the issue ordered a type approved one now 3 times the cost but if it works then it's worth it

Apart from the air leaks issues mentioned by others, can you get the engine and exhaust up to full operating temperature before the test? Some "Sports" cats are not that good at working unless fully warmed up.

Air/exhaust leaks don't always seem that visible, are there any flexi pipe sections? They seem to cause frequent problems.

 

[Deleted member 26715]

Apart from the air leaks issues mentioned by others, can you get the engine and exhaust up to full operating temperature before the test? Some "Sports" cats are not that good at working unless fully warmed up.

Air/exhaust leaks don't always seem that visible, are there any flexi pipe sections? They seem to cause frequent problems.

Getting it up to temperature with an Italian tune up is difficult as it's not road registered, so it can only be done statically, although it's booked in on Thursday with a rolling road specialist, so at least he should be able to simulate a drive, but that will not help me on the retest, however if he confirms that is the issue I do have the option to drive it there, I would prefer not to. I would like to do my shake down tests after it's registered. There's no flexi involved, it comes as a 4-2-1 which has the Lambda, then straight onto the Cat, then stainless to the back & the silencer across the back of he car. Hopefully the new Cat which is due before 12:08 via DHL will sort out the issues, assuming it's a straight swap

 

[Deleted member 26715]

Cat here ahead of target, looks the same which is good, it's a while since I lifted the one that's on, but first impression is this one is much heavier

 

[Scottish Scrutineer]

Cat here ahead of target, looks the same which is good, it's a while since I lifted the one that's on, but first impression is this one is much heavier

I hope this fixes the problem. The RR session will be helpful too. If you've not witnessed one before, it can be a bit intimidating, especially if its your car