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Strange running problems.

Posted: Fri Jun 11, 2004 12:16 pm
by Karl_CLCoupe
I was trying a GT dash in my car, and started the car up from cold. Revved it to 6000rpm, and the car stalled. Upon starting the car again, the car started chugging. with a few blips of the throttle this sorted itself. I left it a bit, and then revved to 6000rpm, to see whether the same problem would occur, it didn't, but as soon as the needle hit 5krpm, the oil warning light and buzzer came on. Switched the engine off, and left a bit, revved to 5krpm, again oil light and buzzer. after trying this a further time to gain same results, I thought I would leave the car running longer, and then it cured itself. Is this the sign of something to come, or is it the car objecting to abuse from a cold start?

Karl.

Posted: Fri Jun 11, 2004 5:28 pm
by Tahrey1043
mmm, well, 5 or more thousand revs right from the key turn isnt too great an idea, til the oil's circulating right, which might be a good 15 seconds (at least, going from the valve noise i get :D). dunno about that 6000rpm stall though... did you build up to it, or turn the key and floor it? (maybe the system hadnt built up enough fuel pressure?!)

stalling the engine from speed does tend to make it a bit reluctant to start though - i tend to run the starter a few extra seconds to give it more encouragment, then treat the throttle gently for a moment.

may sound a stupid question, but have you checked/topped up the oil recently? the only time i've had the oil buzzer is when i took a corner really hard, with the an oil level that turned out to be several mils below "MIN". (drove all the way home very slowly after that)

Posted: Fri Jun 11, 2004 5:32 pm
by Karl_CLCoupe
I think I will give it another look, but as far as I'm aware, oil and everything seemed ok last time I checked, mind you that was some 3 months ago, I suppose I was thinking since it hasn't gone anywhere it should be ok. Start with the basics I guess then... :oops:

Karl.

Posted: Fri Jun 11, 2004 5:43 pm
by Tahrey1043
:shock:

3 months is a LONG time for something like that to go wrong in.

The co-worker what did my door in? She's not driving that battered escort any more. Reason? It developed an oil leak, began to need daily top ups, she either forgot it one day last week, or it got worse - and the whole thing ran "dry" (well, terminally low) at 65mph on the M42. Luckily for her it was a gradual, if somewhat rapid, loss of power (something overheated and made a hole in the head? or it just got "sticky") as there was still a little oil left (magnatec? :D), rather than the whole thing seizing tight as it might with zero oil.
Was still beyond salvage though!

Bet yours will be just fine, halfway between MIN and MAX now i've said that :)

Posted: Fri Jun 11, 2004 6:25 pm
by hardhitter
You don't want to be revving your motor that high from cold mate.

If you have revved it that hard from starting it cold, then your doing the engine no favours at all. Plus if the low oil pressure light/buzzer came on then it's harming your engine.

I would say the car needs to be at normal running temp (around 80°C) after about 10-15 mins driving, before revving high. Before it's warmed up I would keep it under 3k.

Posted: Fri Jun 11, 2004 6:46 pm
by LogIK
Couldn't agree more.

How would you like it if I woke you up in the morning and forced you to run around the block at full pelt without a warm up?

That's how your car feels right now :P

Posted: Fri Jun 11, 2004 11:52 pm
by Gareth_GT_Hatch
Surely youve seen that GTX magnatec advert?
*switches engine on*

owwwwwwwww,<gear change>owwwwwwwwwwwww,<gear change> And so on.

What are you doing revving it to 6000rpm when ur not driving it anyway. Only idiots do that (and drunk G40 owners! :) )

Posted: Sat Jun 12, 2004 1:00 am
by Revis
i have to agree with the above statements. That was a silly thing to do. Why did u do it anyway. wat purpose did it serve rather than hurt ur engine? :?

Posted: Sat Jun 12, 2004 1:03 am
by robz
yeh cnt really c y you wood have 2 rev it like that!??!

as ebody has said, its not advisable! "hardhitters" figures of time to warm up ect sound about rite, u shood try following them.
How would you like it if I woke you up in the morning and forced you to run around the block at full pelt without a warm up?

That's how your car feels right now
excellent comparisson m8! :lol:

Posted: Sat Jun 12, 2004 2:25 pm
by DanW
my engine never gets to 80°C thou :? or am I looking at the wrong temp light?

Posted: Sat Jun 12, 2004 3:59 pm
by SpikeyG40
never a good idea to revv the engine when its cold! the other day i found if ya gave it a short sharp burst of power n then come back off the gas to a stop, mine seemed to near stall! nuttin to worry about in my mind! :lol: just av to be steady wit the old girl!

Posted: Sat Jun 12, 2004 4:40 pm
by Tahrey1043
I've found a good way to make the battery light come on and the whole thing shudder a bit is to forget to change down round a tight turn-off, put foot down at 15mph in top for a few secs ("doh!").. then clutch down and lift off throttle at the same time! Damn near stalls til you get it into 2nd. Problem of drastic over-fuelling most probably..

As for revving it up... well, i'm not so kind as that. I'll give it 10 seconds or so til the oil's moving before "punching it" and the cam chatter dies down, and maybe not go over 4000 for the first minute... but no problems with using full throttle from the off, or going higher after that! Doesn't *seem* to have caused any harm. (then again i use fairly good oil and make sure it's topped up high 95% of the time). And if it's been standing less than 5 minutes after going somewhere... rubber burning time.
(( if i'm in a hurry of course... there's plenty trips where i don't see the far side of 2500 outside of 1st ))

If i was to wait 10 minutes and/or til it reached the high 80s before taking it above 3000rpm... i'd never get past 55mph! A lot of my journeys take less than 15 minutes (yeah, i should bike... bite me, most routes take in a hilly, windy, and rather sparse bit of the midlands with "high" speed limits - for a cycle, anyway). Also, just like Dans ---- the Polo engine seems to have captured the spirit of the Beetle and I could quite happily remove the cooling fan without ever having a problem. It's a very rare day when it switches on, and it only has to run for about 30 seconds - the needle drops like a stone! (at least it switches on at the right temperature, by the guage, so i know the measurement is accurate... assuming BOTH senders aren't equally knackered).

Most of the time it hardly ekes over 70'c even by the end of a slow, drawn out cross-city trip! :D :D

Wonder what THAT does for the oil :shock: :) I just pray anything over room temperature is good enough!

Posted: Sat Jun 12, 2004 9:06 pm
by Karl_CLCoupe
It was a silly thing I know, but I was testing the rev counter out (kinda got carried away). Very foolish of me. Now then, I'm not sure though whether the GT dash I put in is playing up: I have left the car running (I have paid attention), and its been left for 15 minutes. But the damn buzzer and light still come on, this time at 2700 rpm. The engine has warmed up by this time, and I can't fathom out what it is. I tried the same thing with my CL dash, and nothing happened, no oil light or anything, which leads me to believe it was my dash.

Any one done this mod and had similar problems?

I have checked the oil level, and it is fine, its at the top of the notch on the dipstick. Speaking of dipsticks: I am a dipstick for what I did :oops:

Thanks.

Karl.

Posted: Sat Jun 12, 2004 9:58 pm
by robz
dnt worry bout it m8, me were mre concernd bout u blowing up ur polo!

not sure bout the dash prob. another view is that your old Cl dash wasnt workin porperly so didnt show the lights on?! i no that doesnt help but its a possibility

Posted: Sat Jun 12, 2004 10:16 pm
by Karl_CLCoupe
Do you reckon theres a way of ruling the dash out? Maybe change the oil pressure switch or summit? I believe GT dashes can give false readings on lower spec models though.

Any help appreciated.

Karl.