K Series Cold Running issue - Page 5

SD1too · 24th July 2020, 09:24

Quote:

Originally Posted by mbonwick

The FFS episode made no effect on the running issue - just as bad both before & after, so I'm confident it's not the filter.

Hello Mike,

As you've not found the cause of your problems yet, and they do match fuel starvation, would you consider attaching a gauge to the fuel line? Your engine needs 3.5 bar.

Simon

mbonwick · 24th July 2020, 13:17

I have thought about doing that, but I'm not sure what type the connection on the end of the fuel rail is? Had a quick look and it didn't look like a schrader type?

I disagree that it's fuel starvation, if anything I'd say its the complete opposite, as it stinks of unburned fuel when it's running rough, and generally feels bogged down at low revs when driving - but is fine at higher revs.

Regardless though, I do think fuel pressure is a good one to look at if I can work out how.

SD1too · 24th July 2020, 18:48

Quote:

Originally Posted by mbonwick

... I'm not sure what type the connection on the end of the fuel rail is? Had a quick look and it didn't look like a schrader type?

Does this help?

Quote:

Originally Posted by mbonwick

I disagree that it's fuel starvation, if anything I'd say its the complete opposite, as it stinks of unburned fuel when it's running rough, and generally feels bogged down at low revs when driving - but is fine at higher revs.

So do you think it's an ignition problem then? I see that you haven't tried new coil packs. Misfiring is a classic symptom of a failing ignition module and it would disguise itself as a rich mixture.

Simon

mbonwick · 24th July 2020, 20:28

Thanks Simon, that link is helpful - will need to acquire a pressure gauge with tube but that's no hardship.

I don't think it's an ignition issue, as everything feels normal higher up the rev range. It feels very choked up below c. 2500rpm then frees up. Just about everything I've read suggests weak/failing coils would show up more at high speed when there's less charging time and cylinder pressures are higher. Coil packs aren't actually that old, 5years max, and were fine until the ported head/metal manifold went on.

SD1too · 24th July 2020, 22:13

Quote:

Originally Posted by mbonwick

... and were fine until the ported head/metal manifold went on.

I've reviewed the whole thread to try to get a clear picture. You have a VVC manifold and a replacement head which has been ported. You've also been struggling with this for a month.

How about putting the engine back to standard? Can you refit your factory cylinder head and inlet manifold? i haven't seen any mention of changes to the exhaust system or fuelling to complement the modified head and inlet manifold.

Simon

mbonwick · 25th July 2020, 13:39

I've actually been battling with this for nearer 18 months Simon, initially with a set of 135 cams fitted which were then removed to eliminate them.
While I do still have the original head, it's pretty much scrap having been skimmed multiple times, and needs all the valve stem seals replacing - so I'd rather not put it back in.

Having spoken with the well regarded K-series tuning experts like DVAPower and KMaps, they're all in agreement that porting/manifold alone would not cause this issue, and when they tune they stay away from adjusting idle settings (other than idle speed and properly setting the IACV/ HOTDPOS value in T4).

It also wouldn't explain the intermittent reluctance to start, nor the gradual worsening of symptoms.

I will have a go at exploring the fuel side of things - but again, it doesn't seen to really fit the bill for fuel starvation. Yes it can struggle to start, but will then be fine at high revs which surely necessitates a higher fuel demand??

roverbarmy · 25th July 2020, 13:54

I had a quick scan through your posts and you haven't mentioned changing the plug leads. I've had several cars where the leads have broken down over time. The graphite leads tend to harden and crack, forcing the spark to have to make several jumps before it gets to the plug. May be worth a few quid to eliminate them? I've found cars to be transformed by this simple swap!

mbonwick · 13th August 2020, 18:30

Thread revival!

I've given the car a good solid 3 weeks of going to work every day (or in other words, I haven't had time to do anything), and the codes I've read off just now are
P1300 - Boost Calibration Malfunction
P1316 - Misfire increase emissions
P1590 - ???

Plus 2 not relevant ones
P0501 - speed sensor (suspect one of the rear wheel bearings/ABS)
P1520 - every K-series has this dummy error.

So not much to go on...if anyone has any bright ideas I'd love to hear!

sworks · 16th August 2020, 08:55

Boost sensor is a strange one as yours is an 1800 nasp isn’t it? I suppose it could be map related but I’d expect a map related fault over boost. Are you running the correct ecu? What are you using to read the codes? My gut feeling allthough a lot of work is to refit to standard and try

SD1too · 16th August 2020, 10:05

Quote:

Originally Posted by sworks

What are you using to read the codes? My gut feeling allthough a lot of work is to refit to standard ...

Quote:

Originally Posted by mbonwick

P1300 - Boost Calibration Malfunction
P1316 - Misfire increase emissions
P1590 - ???

Michael, I thought you'd like to know RAVE's description of these codes:

P1300 = misfire detected sufficient to cause catalyst damage
P1316 = misfire causing excess emissions
P1590 = not listed

They don't really help you do they.

Simon

25th July 2020, 13:54	#47
roverbarmy This is my second home Roverless + 1.7D Sportage Join Date: Aug 2014 Location: East Norfolk Posts: 7,050 Thanks: 729 Thanked 2,021 Times in 1,449 Posts	I had a quick scan through your posts and you haven't mentioned changing the plug leads. I've had several cars where the leads have broken down over time. The graphite leads tend to harden and crack, forcing the spark to have to make several jumps before it gets to the plug. May be worth a few quid to eliminate them? I've found cars to be transformed by this simple swap! __________________ Oil in my veins!

16th August 2020, 08:55	#49
sworks Been absent for a while… Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007 Location: Cumbria Posts: 13,065 Thanks: 1,033 Thanked 1,686 Times in 1,040 Posts	Boost sensor is a strange one as yours is an 1800 nasp isn’t it? I suppose it could be map related but I’d expect a map related fault over boost. Are you running the correct ecu? What are you using to read the codes? My gut feeling allthough a lot of work is to refit to standard and try __________________ ................................................. 'Marmite' Possibly one of the most famous 75 tourers produced! left the production line as the last of only Three Rover 75 tourers produced in Trophy Yellow. 48 hours later Longbridge closed. The last sold ordered 75 Tourer. Paid for by the Phoenix Four and handed over by John Towers to the Warwickshire Northampton Air ambulance service as a Rapid Response vehicle

24th July 2020, 13:17	#42
mbonwick Gets stuck in Connoisseur SE 1.8 Auto Saloon Join Date: Jul 2015 Location: Kendal Posts: 633 Thanks: 129 Thanked 176 Times in 147 Posts	I have thought about doing that, but I'm not sure what type the connection on the end of the fuel rail is? Had a quick look and it didn't look like a schrader type? I disagree that it's fuel starvation, if anything I'd say its the complete opposite, as it stinks of unburned fuel when it's running rough, and generally feels bogged down at low revs when driving - but is fine at higher revs. Regardless though, I do think fuel pressure is a good one to look at if I can work out how.

24th July 2020, 20:28	#44
mbonwick Gets stuck in Connoisseur SE 1.8 Auto Saloon Join Date: Jul 2015 Location: Kendal Posts: 633 Thanks: 129 Thanked 176 Times in 147 Posts	Thanks Simon, that link is helpful - will need to acquire a pressure gauge with tube but that's no hardship. I don't think it's an ignition issue, as everything feels normal higher up the rev range. It feels very choked up below c. 2500rpm then frees up. Just about everything I've read suggests weak/failing coils would show up more at high speed when there's less charging time and cylinder pressures are higher. Coil packs aren't actually that old, 5years max, and were fine until the ported head/metal manifold went on.

25th July 2020, 13:39	#46
mbonwick Gets stuck in Connoisseur SE 1.8 Auto Saloon Join Date: Jul 2015 Location: Kendal Posts: 633 Thanks: 129 Thanked 176 Times in 147 Posts	I've actually been battling with this for nearer 18 months Simon, initially with a set of 135 cams fitted which were then removed to eliminate them. While I do still have the original head, it's pretty much scrap having been skimmed multiple times, and needs all the valve stem seals replacing - so I'd rather not put it back in. Having spoken with the well regarded K-series tuning experts like DVAPower and KMaps, they're all in agreement that porting/manifold alone would not cause this issue, and when they tune they stay away from adjusting idle settings (other than idle speed and properly setting the IACV/ HOTDPOS value in T4). It also wouldn't explain the intermittent reluctance to start, nor the gradual worsening of symptoms. I will have a go at exploring the fuel side of things - but again, it doesn't seen to really fit the bill for fuel starvation. Yes it can struggle to start, but will then be fine at high revs which surely necessitates a higher fuel demand??

13th August 2020, 18:30	#48
mbonwick Gets stuck in Connoisseur SE 1.8 Auto Saloon Join Date: Jul 2015 Location: Kendal Posts: 633 Thanks: 129 Thanked 176 Times in 147 Posts	Thread revival! I've given the car a good solid 3 weeks of going to work every day (or in other words, I haven't had time to do anything), and the codes I've read off just now are P1300 - Boost Calibration Malfunction P1316 - Misfire increase emissions P1590 - ??? Plus 2 not relevant ones P0501 - speed sensor (suspect one of the rear wheel bearings/ABS) P1520 - every K-series has this dummy error. So not much to go on...if anyone has any bright ideas I'd love to hear!