Intermittent surge and then no power... then ok

It sounds like one bank is going down then coming back.
I think Steve Magnuson is better to walk you through this. It's been awhile since I've worked on the tr....so I don't want to misdirect you.
I do believe it could be the tacometric relay or a module on top of the ignition coils.
Pull and reset the harness to the modules on top of the coils and see.

Shamile

Freeze....Miami Vice!

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I had the same issue, the fix was the large C12 round connector in the right rear fender area. The locking ring was broken causing a bad connection between the pins.

 

Like this?
https://youtu.be/BBMYtSt9yoA

In my case, it was the coil module on top of the coil.
Swap them over. If the engine turns but won't start, the it's likely your LH (driver side coil module). If the problem persists after swapping them back, then that's good confirmation.

This is only from memory so yes, go with what Steve says.

 

Great to hear that you solved it. Just for info, when you say "exactly that" which post do you refer to? Mine was the same as ozziindaaus.

 

Like a hot chick telling you....

I like you....but as a friend.

Kind of a let down there Rpissm lol

Well, let us know how things progress.

Shamile

Freeze. . . Miami Vice!

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Apologies - I misunderstood.

In my case when I did the first coil swap, the result was slightly different but the bank was still not ok. It turned out that lightening had struck twice and both coils were at different stages of being shot. Pulled the ones from the 550 to check, and it was indeed the case.

Not suggesting that it will be the case, but just to say it does happen.

Good luck with the hunt.

 

The problem also pretty much defines how a fuse box connection for the fuel pumps goes bad.

Usually but not always a bad ignition transistor will just stop. It doesn't usually come and go. The pump connection at the fuse board does.

 

Coil modules, not the coils in my case
http://www.ferrarichat.com/forum/boxers-tr-m/529535-87-tr-rough-idle-stalling-surging.html
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You might find this old thread on coils & modules helpful:
http://www.ferrarichat.com/forum/boxers-tr-m/279017-testarossa-coil-module-thread.html

 

I had this happen to me in the first months of ownership. It was one of the 30? pin connectors on the passenger side of the engine. The locking ring had a crack in and thus under certain conditions, I would loose power. Back at home, I let it idle and giggled wires until I found the offender.

Just another thing to check thats easy and free.

 

If it is the connector, its a $30 fix and about 1 hour of your time.

I should have read the replies better....1trick6 and I had the same failure. But its cheap and easy to remedy.

 

Hey Christian,
My fix was from your advice, just passing info along to others, which is why this forum is so great.

 

I've replaced both coil modules but don't remember them being intermittent. They just went out on me if I remember correctly.

I do like Rifledriver ' s response about the fuel pump relays on the fuse box. Have you looked at them for melting plastic surrounding them? How about melting on those white connectors?


Shamile

Freeze. . . Miami Vice!

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In my case, the issue was intermittent, and so took a while to trace, and it showed itself only when the car was warm.

 

I don't know if this is relevant or not, but my car had both EHAs leaking. My mechanic indicated when the car was started there was a strong smell of gas which almost drove them out of the shop (perhaps a small bit of exaggeration). He indicated that the EHAs were more "sweating" gas as opposed to a steady stream. (That got me concerned as to whether this might actually start a fire - leaking gas on a hot engine is never good). The units have been sent back to CIS Flowtech so new ones can be recalibrated. There were some other issues that readers had found and I tried to reference them in the thread below. Might be that just one of the EHAs on your car is leaking. Just another possibility.

http://www.ferrarichat.com/forum/boxers-tr-m/552433-testarossa-ecu-disconnect-running-hot.html