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E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 08-14-2009, 07:28 PM
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Temp issues

The temp gauge sits at 3/4 once the engine is warmed up, when i drive her hard shes going up to the red, and wont come back down.
New water pump, fresh coolant. i think there might be a block in the block? or something? the car has always sat just over (read marginally) half way ever since owning the car, but its got to the stage its at now. how can i test for/fix a blockage? the radiator is clear (flushed it while i had out for the TB/waterpump). any other ideas? ive swapped the thermostat with the one from my parts car so either they are both dead (unlikely?) or its something else.
plz help

btw steve going to the yard in an hour or so, so ill PM you when i get back

Edit: I have a CAI (aka HAI), but as i said, the car was running high to start with, before i put that on. i know that isnt probably doing the car any favours having that but im going to move that/make a heat shield
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Last edited by _Ethrty-Andy_; 08-14-2009 at 07:46 PM.
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  #2  
Old 08-14-2009, 08:06 PM
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Quote:
Originally Posted by ethrty View Post

btw steve going to the yard in an hour or so, so ill pm you when i get back
im hoping for good news
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Old 08-14-2009, 10:16 PM
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Originally Posted by fcsteve View Post
im hoping for good news
bad news most BMWs ive ever seen at the yard but only one facelift E30.

ill keep my eyes and ears open for sure though. theres a guy i know who wrecks BMWs for a living, and i know hes got a few sets of bumpers, but i dont know if he will seperate the trim :/
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Old 08-14-2009, 11:03 PM
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Saw my friend take an air compressor to the topside of his motor a few weeks back and brown sludge came out the bottom, idk if its a good way to "check" but its worth a try if you havent already
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Old 08-14-2009, 11:48 PM
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Quote:
Originally Posted by noexceptions325 View Post
Saw my friend take an air compressor to the topside of his motor a few weeks back and brown sludge came out the bottom, idk if its a good way to "check" but its worth a try if you havent already
lol att first read i thought you meant like bashed the top of the motor with the tank... dissapointed to assure mysefl it wasnt lol
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Old 08-15-2009, 08:38 AM
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Quote:
Originally Posted by Ethrty View Post
bad news most BMWs ive ever seen at the yard but only one facelift E30.

ill keep my eyes and ears open for sure though. theres a guy i know who wrecks BMWs for a living, and i know hes got a few sets of bumpers, but i dont know if he will seperate the trim :/
bummer
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Old 08-15-2009, 03:35 PM
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Quote:
Originally Posted by fcsteve View Post
bummer
check your pm's
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Old 08-15-2009, 03:36 PM
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does anyone have an idea about my problem??
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Old 08-15-2009, 04:13 PM
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Originally Posted by Ethrty View Post
does anyone have an idea about my problem??
maybe the thermostat is no good, or u didnt bleed the system all the way. Maybe u messed something up when u swapped trannys.
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Old 08-16-2009, 12:23 AM
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does anyone know how to test the temperature sender, if thats possible? or in fact where that actually is? lol noob question

wouldnt have come from the traanny swap itself. but i did to the t/belt and waterpump at the same time
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Old 08-16-2009, 12:40 AM
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Originally Posted by Ethrty View Post
does anyone know how to test the temperature sender, if thats possible? or in fact where that actually is? lol noob question

wouldnt have come from the traanny swap itself. but i did to the t/belt and waterpump at the same time
yeah i didnt mean because of the swap itself, i just meant maybe u moved something and didnt put it back.
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Old 08-16-2009, 01:02 AM
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yeah i didnt mean because of the swap itself, i just meant maybe u moved something and didnt put it back.
i see. i didnt have to unplug any electrical stuff at all, bar the shifter assembly
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Old 08-17-2009, 04:57 AM
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Did you bleed the system? Check the fan clutch?
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Old 08-17-2009, 05:36 AM
1979Marshall 1979Marshall is offline
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Got some ideas. It might be long winded so I'm pm you after I get some stuff done at work and have time.

But for starts, start by finding out if your car is actually running hot. I don't know if there are resistance plots for the thermistors which are your sending units. Resistance changes as temp rises....Bentley or the internet might know that, but you should still cross ref. that with an infrared gun. Do buy one today and you can know for sure your car's over heating.

Just don't kill it on the way to the store and blow the head gasket. Thats a bad way to begin rebuilding your engine.

But i think this sounds like a water pump issue.
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Old 08-17-2009, 01:12 PM
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im leaning towards a dodg sender or there being an air bubble in the system, but im not sure how to get it out. Where is the temperature sender? The car has always run over the center line. so its possibly more likely to be that?
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Old 08-17-2009, 07:56 PM
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could be the sender, or just the temp sensor! I believe its the very front sensor, havent ever had one go out on my E30's but a dodge shadow my cousin had the sensor went out and sat on the red after warming up.. we checked everything, then i checked the sensor resistance and that was the problem... 8 dollar fix
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Old 08-18-2009, 03:20 AM
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Quote:
Originally Posted by noexceptions325 View Post
could be the sender, or just the temp sensor! I believe its the very front sensor, havent ever had one go out on my E30's but a dodge shadow my cousin had the sensor went out and sat on the red after warming up.. we checked everything, then i checked the sensor resistance and that was the problem... 8 dollar fix
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im not sure i know where you mean sorry. god i feel noob lol. is it on the radiator? the only electrical thing that goes to there on my car is the thermostat?
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Old 08-18-2009, 07:09 AM
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yeh there are three sensors on the top of the thermostat housing 1 blue, 1carmel colored, 1 brown.... i think its the brown one but check in haynes
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Old 09-13-2009, 06:51 PM
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ive experianced overheating problems on both my 90e34 and 87e30 after doing waterpump / t-stat changes and found that burping system thru the bleeder on t-stat housing doesnt always work the first time. i actually had to park on an incline (front up) bleed and refill several times for bubble to clear. good luck.
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Old 09-13-2009, 07:03 PM
ridefree89hd ridefree89hd is offline
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ive experianced overheating probs after waterpump/t-stat work on both my 90e34 and 87e30 and found using the bleeder on t-stat housing is not always effective removing air bubbles, i actually parked on an incline (front up) and had to bleed and refill several times for prob. to clear. good luck
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Old 09-13-2009, 07:18 PM
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did you do a coolant flush when you did the tb? i mean a full flush, not just the radiator, but bolck as well
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Old 09-13-2009, 09:09 PM
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Quote:
Originally Posted by downhiller View Post
did you do a coolant flush when you did the tb? i mean a full flush, not just the radiator, but bolck as well
No i didnt. i wish i had. I changed the sender and tightened the bolts on the back of the gauge cluster and now the gauge sits at just shy of 3/4 all the time, ie it doesnt ever jump around anymore. so either its the wrong sender or im not getting efficient cooling still. I hard wired the auxilary fan on so that runs all the time the car is on to help cooling, but still no luck. I dunno what the hell is going on.
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Old 09-13-2009, 10:01 PM
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Quote:
Originally Posted by Ethrty View Post
No i didnt. i wish i had. I changed the sender and tightened the bolts on the back of the gauge cluster and now the gauge sits at just shy of 3/4 all the time, ie it doesnt ever jump around anymore. so either its the wrong sender or im not getting efficient cooling still. I hard wired the auxilary fan on so that runs all the time the car is on to help cooling, but still no luck. I dunno what the hell is going on.
well you can have a couple issues, too much fuel, or a sticking t-stat. to test a t-stat, put in a pot of water with a thermometer to measure water heat. put on stove and set stove to high. wait til t-stat opens and look at thermometer. compare reading with oe specs.

too much fuel part, that goes into other temp sensors, o2 sensor and whole bunch of other stuff. go cheap first, get a new tstat.then go from there
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Old 09-14-2009, 02:25 AM
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Quote:
Originally Posted by downhiller View Post
well you can have a couple issues, too much fuel, or a sticking t-stat. to test a t-stat, put in a pot of water with a thermometer to measure water heat. put on stove and set stove to high. wait til t-stat opens and look at thermometer. compare reading with oe specs.

too much fuel part, that goes into other temp sensors, o2 sensor and whole bunch of other stuff. go cheap first, get a new tstat.then go from there
The second thing jumps out at me. my fuel economy is really bad. i mean REALLY bad. i thought it was normalish (less economical than my old Sentra but thats coz bigger engine/bigger car etc). What should i be checking? i will check the thermostat on wednesday in the mean time
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Old 09-14-2009, 07:12 AM
danielw05 danielw05 is offline
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+1 on burping the system once or twice...

http://bimmerfest.com/forums/showthr...highlight=burp
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