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The real cause of injector rattle?
(09-05-2016, 10:18 AM)powerandtorque Wrote:
(07-05-2016, 09:19 AM)JTaylor2005 Wrote: Tbf I don't think I am running it any hotter than you guys are. I just have a temperature gauge that works correctly and sits at a temperature that peugeot would have liked it to (90 being dead top of the gauge where it looks good to see the needle)

If Peugeot had wanted to run at 90 degrees, they should have fitted a thermostat rated to that.

Lots of 80's and 90's era Peugeot/Citroen petrol models have 89 degree thermostat's for example.  Equally, there's other Peugeot's out there with considerably low rated thermostats - some 505's for example have 'stats rated down into the 70's.

Being vertical on the gauge is purely an aesthetic thing, although the gauges on many newer cars are "faked" to make them appear vertical even when the temperature is several degrees either side of that.

(07-05-2016, 09:19 AM)JTaylor2005 Wrote: It looks as though I had a problem with a crappy thermostat. When I cleaned up the sensor faces and replaced the temp sensor it raised the reading on the dash gauge. Then when I replaced the stat for a working nice fitting one it now reads a little higher again.

I have spoken to HDI-Tuning's pro-steve and he said there is corrective action in the map for high fuel and coolant temperature but he said that power and performance wont be knocked back until its "really hot" not sure how hot he means tbf haha.

What was the replacement sensor?  I've not looked into HDi ones, but I know older sensors can have difference calibrations which would make the reading inaccurate... plus some aftermarket/pattern sensors can be a bit dubious even if they are supposedly calibrated the same.

Just guessing, but I wonder if that corrective action impacts the pre-injection phase at all?  If so, that might explain why it's reduced the injector rattle, in the same way that rattling injectors shut up over 3200rpm as that's why pre-injection changes (or is stopped completely, I can't remember now)

(08-05-2016, 08:12 PM)Paul_13 Wrote: I think that's what's done my HG in, I left it running /revving it to get the fans on. Temp went up to over 90 to near 100 and no fans.

Doubt it - that still won't be boiling a correctly pressurised cooling system remember.

I suspect it was the absolute flogging you'd been giving it before hand despite knowing the head gasket was on its last legs that finished it off... mechanical sympathy, Paul_13 style lol

The low-speed fans don't work on mine (I think one of the two fans is dead, so as low-speed works by running the fans in series, neither works on slow) and thus in traffic eventually the temperature will climb to high 90's before dropping to low-90's and repeating as the fan cycles.  Never done it any harm, exactly as it shouldn't on a pressurised system.

Worth remembering that many cars don't even turn on the slow-speed fans until high-90's - standard 205 GTI's are like this for example with the red-banded thermoswitches (97 degree slow speed and 102 degree high-speed fan).

(08-05-2016, 08:40 PM)JTaylor2005 Wrote: I have removed the temperature sensor plug and both my fans are working on high speed but still nothing on low from what I can tell :/ which is kinda annoying. It seems that with the ill fitting thermostat it stayed cold enough to not need the fans but with the one that fits snug and I presume is working correctly (as its a gates expensive one) now its getting hot enough to need the low speed fan :/

Assumption is the mother of all f**k-ups, remember that Wink

All the thermostat does is to regulate the temperature by restricting coolant flow to the radiator below a given temperature.  It thus will have no impact on the cooling fans at all, as the fans won't come on until well over the temperature that the thermostat is already open and effectively out of the equation.

The only way that they're vaguely related is that if the engine is being regulated to a temperature higher than it was, then in traffic the temperature has to raise less before it will get to the point where the fans should come on.  That's it.  Even with no thermostat at all and the engine running extremely cool, eventually when sat in traffic it'll heat up to the point where the fans kick in, just take longer to increase (say) 40 degrees than to increase 10 degrees from the 'stat temp.

I still maintain that something is amiss, be it the temperature gauge accuracy or something more fundamental, as on cruise you should be sitting on the thermostats opening temperature and not higher than that - the cooling effect of the air through the radiator is far more than the heat that the engine is dumping into the cooling system in that circumstance, thus the temperature will drop until the point at which the thermostat is almost closed.  With an 83 degree 'stat you should really be sitting at that temperature, give or take a little for tolerances etc, and certainly that's my experience with HDi's I've owned/driven.



I can't see what would be amiss now though tbh really. I have an 83c rated thermostat made by gates which I heard is a good brand. The gauge according to people on here underreads compared to the ecu temp signal. Maybe having replaced the temp sensor and gotten rid of the old coroded washer between the sensor and the block could that have given a higher reading as it has less resistance than it did before??

I need to use a pp200 but litterally can't find anyone with it and I don't have a laptop it will work on. Would be nice to just literally plug it in for 5 mins to just check the temp compared to the gauge.

The coolant has been bled like 3/4 times now im 99.999% sure there is no air left in it now.

The temp sensor was a eurocarparts one. Can't remember what brand but I seem to remember it was a good brand.
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Messages In This Thread
RE: The real cause of injector rattle? - by dimar - 15-06-2015, 09:05 PM
RE: The real cause of injector rattle? - by td163 - 17-07-2015, 10:23 PM
RE: The real cause of injector rattle? - by td163 - 18-07-2015, 09:46 AM
RE: The real cause of injector rattle? - by cully - 18-07-2015, 09:55 PM
RE: The real cause of injector rattle? - by cully - 19-07-2015, 09:35 AM
RE: The real cause of injector rattle? - by Ruan - 19-07-2015, 01:30 PM
RE: The real cause of injector rattle? - by MY95 - 02-05-2016, 02:59 PM
RE: The real cause of injector rattle? - by Niall - 02-05-2016, 03:07 PM
RE: The real cause of injector rattle? - by Piggy - 02-05-2016, 09:08 PM
RE: The real cause of injector rattle? - by MY95 - 02-05-2016, 10:55 PM
RE: The real cause of injector rattle? - by Piggy - 03-05-2016, 05:06 AM
RE: The real cause of injector rattle? - by Piggy - 03-05-2016, 06:39 AM
RE: The real cause of injector rattle? - by Ruan - 03-05-2016, 10:55 AM
RE: The real cause of injector rattle? - by Ruan - 03-05-2016, 11:36 AM
RE: The real cause of injector rattle? - by Piggy - 03-05-2016, 11:46 AM
RE: The real cause of injector rattle? - by Ruan - 03-05-2016, 11:59 AM
RE: The real cause of injector rattle? - by Ruan - 03-05-2016, 02:18 PM
RE: The real cause of injector rattle? - by MY95 - 05-05-2016, 01:12 PM
RE: The real cause of injector rattle? - by Piggy - 05-05-2016, 04:45 PM
RE: The real cause of injector rattle? - by Ruan - 05-05-2016, 05:12 PM
RE: The real cause of injector rattle? - by Piggy - 07-05-2016, 10:10 AM
RE: The real cause of injector rattle? - by JTaylor2005 - 09-05-2016, 02:35 PM
RE: The real cause of injector rattle? - by Piggy - 17-05-2016, 06:12 PM
RE: The real cause of injector rattle? - by Piggy - 17-05-2016, 06:27 PM
RE: The real cause of injector rattle? - by Ruan - 18-05-2016, 09:57 AM
RE: The real cause of injector rattle? - by Ruan - 18-05-2016, 03:04 PM
RE: The real cause of injector rattle? - by Ruan - 18-05-2016, 04:08 PM
RE: The real cause of injector rattle? - by MY95 - 27-05-2016, 03:56 PM
RE: The real cause of injector rattle? - by Ruan - 27-05-2016, 04:26 PM

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