P38A Fixing my Cruise Control...maybe.

DanClarke · May 29, 2018

Ok, I don't go any long distances that make it really worthwhile but.......
Its there, it ought to work and it irks me that it doesn't when everything else does.
I think all the Vacuum-hose is pretty perished, so what to replace it with?
Is 7mm ID Silicon Hose ok?, or does that just collapse under the Vacuum involved?
I don't think the ECU is toast, its more likely to be the Brake-switch, but I'm happy to have a bash at fixing it.

Anyone else been down this path too, any pearls of wisdom for me to consume (Oink...Oink).

Cheers!

Grrrrrr · May 29, 2018

@MrGorsky used silicone on his but I don't know the size. It is very colourful, I'll say that!

Mark Piercy · May 30, 2018

Saying nothing about consuming pearls of wisdom???

pwood999 · May 30, 2018

yes silicon does collapse

Assuming the ECU is working, then replacing all the rubber hose (including small bits inside the pump), plus possibly the brake vacuum switch should sort it.

Pump hoses can be checked using RAVE troubleshooting guide, but start by blocking off the long hose to the brake pedal just where it connects to the pump-actuator.

Actuator is quite easy to bench test. Take the whole assembly off & apply 12V to the pump to see if it can build vacuum. If not investigate the small pipes inside the housing. . . . . . and so on. logical steps will result in working cruise . . . . . assuming the engine still works !!

Pete

Grrrrrr · May 30, 2018

pwood999 said:
yes silicon does collapse

Surely that would depend on the type of silicone pipe and the thickness of the pipe?

PPP38vouge · May 30, 2018

Used silicon hoses on my CC, no issues. Replaced the whole lot.

DanClarke · May 30, 2018

OK, for the avoidance of doubt "pearls of wisdom" are NOT in any way associated with necklaces @Mark Piercy.
The rubber vacuum hose on the car is fairly perished and cracked, and I thought I had heard silicon hoses were OK for the job.
It was "sort-of" working at one point ....but kept upping the MPH before the stealer nadgered it in his many attempts to "fix" it.
I think I will have a bash

Mark Piercy · May 31, 2018

DanClarke said:
OK, for the avoidance of doubt "pearls of wisdom" are NOT in any way associated with necklaces @Mark Piercy.
The rubber vacuum hose on the car is fairly perished and cracked, and I thought I had heard silicon hoses were OK for the job.
It was "sort-of" working at one point ....but kept upping the MPH before the stealer nadgered it in his many attempts to "fix" it.
I think I will have a bash

But it's fair to share the knowledge!!

Grrrrrr · May 31, 2018

Lots of silicone tubing claiming to be OK for vacuum on the Bay. Have a look at Demon Tweaks.

wammers · May 31, 2018

DanClarke said:
OK, for the avoidance of doubt "pearls of wisdom" are NOT in any way associated with necklaces @Mark Piercy.
The rubber vacuum hose on the car is fairly perished and cracked, and I thought I had heard silicon hoses were OK for the job.
It was "sort-of" working at one point ....but kept upping the MPH before the stealer nadgered it in his many attempts to "fix" it.
I think I will have a bash

Silicone vacuum hose will be fine.

MrGorsky · Jun 21, 2018

I think it's 5mm ID hose you need. I'd cut your old hose and measure it carefully. I used silicone vacuum hose (bright blue for some reason!) and it's been fine, but I bought too big ID so had to put cable ties on to make sure the connection was tight.

Morning all.

Saint.V8 · Jun 21, 2018

MrGorsky said:
I think it's 5mm ID hose you need. I'd cut your old hose and measure it carefully. I used silicone vacuum hose (bright blue for some reason!) and it's been fine, but I bought too big ID so had to put cable ties on to make sure the connection was tight.

Morning all.

6.36pm.....morning......????????

Where you at MrG?

MrGorsky · Jun 21, 2018

Hello Ant,
I am in Oregon USA, about halfway up on the coastal highway in my RV.
Regular internet is a thing of the past so I'm not on here so much these days.
I have seen a few P38s around on my drive up from Florida. All of them in "well used" condition!
Al.

Mukiwa · Aug 23, 2018

If you have an oil burner then you just need the relay behind the dash ;-)
No pipes or anything!

tomcat59alan · Aug 24, 2018

Mukiwa said:
If you have an oil burner then you just need the relay behind the dash ;-)
No pipes or anything!

Anyone got a Simple wiring diagram for the weasel C/C? Mine stopped working after I did the heater o rings,may get to look at it whilst I'm not driving thanks in anticipation.

wammers · Aug 24, 2018

tomcat59alan said:
Anyone got a Simple wiring diagram for the weasel C/C? Mine stopped working after I did the heater o rings,may get to look at it whilst I'm not driving thanks in anticipation.

Engine ECU does cruise on diesels. If it's a manual look at the clutch switch.

tomcat59alan · Aug 24, 2018

wammers said:
Engine ECU does cruise on diesels. If it's a manual look at the clutch switch.

Thanks Tony, yup,,its a manual

oakey · Aug 25, 2018

I used silcone pipe from place in Bolton.
Works a treat

tanis8472 · Aug 26, 2018

Mukiwa said:
If you have an oil burner then you just need the relay behind the dash ;-)
No pipes or anything!

Not necessarily, mine stopped working, pulled it out to test wires, put it back in and it's been fine ever since.

tanis8472 · Aug 26, 2018

DanClarke said:
OK, for the avoidance of doubt "pearls of wisdom" are NOT in any way associated with necklaces @Mark Piercy.
The rubber vacuum hose on the car is fairly perished and cracked, and I thought I had heard silicon hoses were OK for the job.
It was "sort-of" working at one point ....but kept upping the MPH before the stealer nadgered it in his many attempts to "fix" it.
I think I will have a bash

So not these pearls then

P38A Fixing my Cruise Control...maybe.

Well-Known Member

Technician, Bodgit & Scarper Ltd

Well fumbled member....

Well-Known Member

Technician, Bodgit & Scarper Ltd

Active Member

Well-Known Member

Well fumbled member....

Technician, Bodgit & Scarper Ltd

No longer with us, RIP

Well-Known Member

Dyed-in-the-wool 100% RR Junkie

Well-Known Member

Well-Known Member

Well-Known Member

No longer with us, RIP

Well-Known Member

Well-Known Member

Active Member

Active Member

Similar threads