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| Home > Help Needed / General Tech Chat > Anopther misfiring problem, Megajolt | |||||||
 52 Posts Member #: 75 Advanced Member |
8th Jul, 2008 at 06:19:00pm
I had help putting the megajolte in, from a friend that have done it before, so I am no expert, but I discovered today that the megajolte still gets signal, even if I take away the wires that my friend said was the wires for the rpm to the megajolt box. (I took them of at the mj side, if I disconnect the sensor the signal disappears |
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52 Posts Member #: 75 Advanced Member |
8th Jul, 2008 at 06:44:57pm
have investigated a bit more, seems like the only wires that is connected to the mj box is 12v supply and the ground but still it gives me rpm(a bit bouncy at times) how can this be? the car starts but misfires |
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1394 Posts Member #: 1346 Post Whore bromsgrove |
8th Jul, 2008 at 10:35:58pm
sounds like you may need to re-wire the MJ, |
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 1497 Posts Member #: 100 Parisien Turbo Expert Paris\' suburb |
9th Jul, 2008 at 06:17:05pm
difficult to diagnose a sticky valve stem, though that's so scaring, that I think you'll check it whatever we can write.
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 1060 Posts Member #: 588 Post Whore Delaware, USA |
10th Jul, 2008 at 01:49:46am
On 9th Jul, 2008 fab said:
difficult to diagnose a sticky valve stem, though that's so scaring, that I think you'll check it whatever we can write. Its easy Fab, just attach a stethescope to the bolts on the rocker cover, the difference in valvetrain noise is obvious, thats how I found mine.... Also the vacuum/boost guage vibrated badly when they were sticking. ...But yes scary is the word... website:- http://www.terryhunt.co.uk
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 1849 Posts Member #: 672 The oversills police Oslo, Norway |
10th Jul, 2008 at 07:00:24am
On 8th Jul, 2008 philc said:
sounds like you may need to re-wire the MJ, I am the one that have helped him wire it up and have done this twice before without troubles, including on my own car of which there are pictures of with the MJ install on here. The Coil and MJ unit share ground connection, and have the + wire taken from the same place also(IIRC, could you check PJ?). , which is a fuse box behind the dash that provides switched power and is live while the starter turns. What interests me on this matter is how it can get an RPM signal when the PIP and SAW wires are disconnected? could this be due to voltage fluctuations as Tel describes? or could it be due to a bad ground connection between the engine and car? Or due to something totally different? Edited by miniminor63 on 10th Jul, 2008. |
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1060 Posts Member #: 588 Post Whore Delaware, USA |
10th Jul, 2008 at 06:25:24pm
On 8th Jul, 2008 petterb said:
have investigated a bit more, seems like the only wires that is connected to the mj box is 12v supply and the ground but still it gives me rpm(a bit bouncy at times) how can this be? the car starts but misfires If I remember correctly you can pick up the rpm signal either from the MJ box or from the EDIS, If you are getting rpm at all it must be connected (unless there is a HUGE amount of interference..) Are sure the rpm signal not taken from the EDIS? also the pip/saw wires must be connected or it would not run!! Edited by Turbo Tel on 10th Jul, 2008. website:- http://www.terryhunt.co.uk
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1849 Posts Member #: 672 The oversills police Oslo, Norway |
10th Jul, 2008 at 10:03:53pm
it runs without any more cables than + and - connected to the mj. the cables are connected to the edis unit though. The rpm he talks about is what he sees on yhe pc when connected |
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1060 Posts Member #: 588 Post Whore Delaware, USA |
12th Jul, 2008 at 02:25:51am
On 10th Jul, 2008 miniminor63 said:
it runs without any more cables than + and - connected to the mj. the cables are connected to the edis unit though. The rpm he talks about is what he sees on yhe pc when connected I see so he has disconnected the wires then?? Well you cannot say what will happen with open inputs. without them being tied down they could pick up interference as thats not how they should be left.. Its not a good test.. Anyway as he still has a misfire without the MJ connected then the sensor, EDIS, coilpack are all suspect. I would look hard at the sensor, I once has the connector go bad on me. looked fine but caused a missfire, After tugging it a bit one wire finally fell off. website:- http://www.terryhunt.co.uk
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52 Posts Member #: 75 Advanced Member |
13th Oct, 2008 at 09:47:43pm
I tried to rewire the signal cables, but no improvement, I tried sevral different wires. what made the trick was to change the megajolte unit, I was able to borrow miniminors old one, and now it works. Is there a way to diagnose the megajolte? to see whats wrong? can there be a difference between 2 versons that make one of them more reciveble to interference? |
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 4559 Posts Member #: 786 Post Whore Bermingum |
13th Oct, 2008 at 10:09:59pm
Hi,
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 189 Posts Member #: 1774 Advanced Member Sydney AUS |
14th Oct, 2008 at 02:00:30am
I didnt think that if the MJ PIP/SAW wires are disconnected but power still applied that it would show 0 rpm...
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52 Posts Member #: 75 Advanced Member |
14th Oct, 2008 at 02:20:24pm
Gavin: I am not sure the old mj ever was ok, anyway the new one have run alot longer than the old one have done and no problems yet.
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1849 Posts Member #: 672 The oversills police Oslo, Norway |
14th Oct, 2008 at 02:33:23pm
Hi Petter, if you deliver it to me, I can do a few checks on it with a multimeter, except for that I dont know. |
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1060 Posts Member #: 588 Post Whore Delaware, USA |
14th Oct, 2008 at 06:46:55pm
website:- http://www.terryhunt.co.uk
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1394 Posts Member #: 1346 Post Whore bromsgrove |
15th Oct, 2008 at 08:23:05pm
have you tried running it with the dissy back in. I have had to do this with mine just to find the problem |
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52 Posts Member #: 75 Advanced Member |
17th Oct, 2008 at 10:46:10am
miniminor, I talked to magne, he aswell promised to have a go, so I'll think i'll send it to him, so can I bother you with something else later instead! |
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