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-   -   318is Engine swap results Tachometer failures (http://www.bimmerfest.com/forums/showthread.php?t=672238)

RaunoV 01-25-2013 03:09 AM

318is Engine swap results Tachometer failures
 
Hi!

Recently i changed my 318is (1995) engine for 525i (1992) one. Almost everything seems to work properly. One of the major issues at the moment is that after driving for a while with warm (temp. gauge in middle) engine tachometer and fuel gauge start jumping and die/drop to 0. When turning on additional electrical devices (for example blow to max, fog lights or using power windows) then these gauges wake up and work a bit more or until i turn those additional devices off. Has anyone any idea about this weird problem?

Second issue is that my full OBC show very funny fuel consumption :) about 4-7L/100km on highroad but when fuel gauge is working it shows about 10L/100km.


I would really appreciate if anyone has opinions or possible solutions..
Regards,
RaunoV

hornhospital 01-25-2013 08:49 AM

You didn't swap in an instrument cluster for a 6 at the same time you replaced your 4 with a 6, did you? The 4 cylinder cluster will work, but it won't read correctly. You need a 6 cylinder cluster. Also, it sounds like your connections on the IC are loose.

RaunoV 01-25-2013 08:56 AM

Quote:

Originally Posted by hornhospital (Post 7337261)
You didn't swap in an instrument cluster for a 6 at the same time you replaced your 4 with a 6, did you? The 4 cylinder cluster will work, but it won't read correctly. You need a 6 cylinder cluster. Also, it sounds like your connections on the IC are loose.

Difference in 4cyl and 6cyl cluster is just how right rpm-s are, and I changed them also. This problem occurred on both clusters. Probably not connections cause both clusters had same issue and this is somethings to do with engine temerature?! Or somethings with electrical system...

hornhospital 01-25-2013 09:32 AM

Electrical system. And why do you think it can't be connections since it does it on both clusters? If the connector plugs are bad, that's exactly how it would react, showing the same symptoms on both clusters.

RaunoV 01-25-2013 09:43 AM

Quote:

Originally Posted by hornhospital (Post 7337362)
Electrical system. And why do you think it can't be connections since it does it on both clusters? If the connector plugs are bad, that's exactly how it would react, showing the same symptoms on both clusters.

And how could you explain that engine swap caused it? As before there wasn't any issues.

B1MM3R 01-25-2013 11:00 AM

Did you make sure all of the ground wires are connected securely?

RaunoV 01-25-2013 12:01 PM

Quote:

Originally Posted by B1MM3R (Post 7337575)
Did you make sure all of the ground wires are connected securely?

I think so. Weird is that it always happens after some time of driving, about 20-30km..If ground is bad, sould it affect all the time?

B1MM3R 01-25-2013 12:03 PM

Not all the time. My dads 318 cluster would randomly act nuts and then he found the ground was loose, tightened it and voila it was fixed.

RaunoV 01-25-2013 12:06 PM

Mhh, okay. Need to find some diagram to check all grounds and not miss any of them.

Any ideas about the second issue? About second issue I noticed that Range is also acting very weird. Today started driving with 98km and after arriving destination (15km) it showed 30km to go..

B1MM3R 01-25-2013 12:33 PM

Are you sure you have a 6 cylinder cluster in the car now? B/c range will be off if not.

RaunoV 01-25-2013 12:50 PM

Quote:

Originally Posted by B1MM3R (Post 7337835)
Are you sure you have a 6 cylinder cluster in the car now? B/c range will be off if not.

Yes, old 318is cluster showed way higher rpm-s. With this cluster rpm-s are normal.

But does that matter that i have 525 ECU? As new engine is older and they don't match with OBC?

B1MM3R 01-25-2013 12:59 PM

No, all of the dme's are the same with (6 cylinders) electrical but just the chip is different in the dme per which engine you have. Im not sure then.

RaunoV 01-25-2013 01:04 PM

Can it be something related to engine temperature sensors?

AS how this ground always fails after some time of driving?! Really confused..

B1MM3R 01-25-2013 01:09 PM

Not sure, any CEL on?

RaunoV 01-25-2013 01:14 PM

Quote:

Originally Posted by B1MM3R (Post 7337948)
Not sure, any CEL on?

Not in cluster, OBC's Check function fails and turns OBC off..

B1MM3R 01-25-2013 01:25 PM

I know what they do...I was saying for the first issue where you asked about temp sensors causing rought idle.


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