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Running trouble with Testarossa after it is warmed up
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Posts: 6Registered: Jun 2012
Anthony
Junior Member


Tuesday, June 05, 2012 3:54 PM

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I have a 1991 Testarossa 20,000 miles, owned since 2008. Used to run flawless. Two years ago I experienced a type of acceleration hesitation that would develop when the car was warm ( driven approx 40 miinutes). Left bank warning light came on stating that this side of the engine was not runing correctly. This has now developed into an ongoing problem of the car when warm suddenly hesitating and then having almost no power, and driving as if the timing were off and the car wants to stall. I have to pull over almost immediately and often get a tow. It will then continue to run like this until it cools down over an hour and then the car will typically restart fine and run fine until warm again. The car still runs great during the first 30 minutes prior to warming up. I have replaced the coils, new fuel pumps x2, checked the fuse panel, checked the fuel injectors, etc.

Has anyone ever had a similar problem?

Any ideas?

Thanks,
Tony
tguanciale@gmail.com


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thank you

Tony Guanciale
tguanciale@gmail.com
513 317-5100


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Posts: 153Registered: Feb 2004
Tom Manchester
Member


Friday, June 08, 2012 4:25 PM

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The symptoms sound very much like my 328 a few years ago. After testing and replacing various components, it turned out to be a faulty fuel pump relay...easy to replace, hard to diagnose!

I suspect that your car's fuel system is similar to mine, but times 2.

TM


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Posts: 6Registered: Jun 2012
Anthony
Junior Member


Friday, June 08, 2012 9:20 PM

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Thanks Tom. Is there a way to test for this other than simply replacing both. I feel as if I have been "throwing parts at the car".
Tony

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Tony Guanciale
tguanciale@gmail.com
513 317-5100


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Posts: 6Registered: Jun 2012
Anthony
Junior Member


Friday, June 08, 2012 9:26 PM

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Tom where did you purchase your fuel pump from?

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Tony Guanciale
tguanciale@gmail.com
513 317-5100


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Posts: 6Registered: Jun 2012
Anthony
Junior Member


Friday, June 08, 2012 9:27 PM

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Sorry, meant fuel pump relay.

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Tony Guanciale
tguanciale@gmail.com
513 317-5100


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Posts: 153Registered: Feb 2004
Tom Manchester
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Monday, June 11, 2012 5:48 PM

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I was able to match it up with a new, solid state relay at my local Napa Auto parts store. I forget exactly how much it cost, but it was less than $10!

It's hard to diagnose because of the way it fails. When it gets hot, the relay coil expands, the insulation breaks down and the magnetic field deteriorates until it can longer maintain the fuel pump connection. So everything tests fine when it is cold. What you could do is test the relay coil resistance when it is cold (should be 1 or 2 ohms), drive the car until it cuts out, then quick test the relay coil resistance again. If it has dropped to near zero, then you've confirmed the problem.

Of course, you could just pop a few bucks and replace it and see if that does the trick.

TM


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Posts: 6Registered: Jun 2012
Anthony
Junior Member


Thursday, June 14, 2012 10:11 AM

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Tom thanks for the further information! I will definitely head to my local NAPA and try to do the same replace both and hope that this will solve my running issues.
Mille Grazie for your input.

Tony

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Tony Guanciale
tguanciale@gmail.com
513 317-5100


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Posts: 6Registered: Jun 2012
Anthony
Junior Member


Sunday, July 22, 2012 4:51 PM

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Tom can you give me the NAPA number for your Ferrari feul pump relay. I was not able to cross reference this at my local NAPA parts store. thank you

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Tony Guanciale
tguanciale@gmail.com
513 317-5100


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Posts: 1Registered: Sep 2012
mmartinho
Junior Member


Thursday, September 27, 2012 3:35 PM

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I have fuel related question, not fuel pump. Anyone recommend adding a fuel additive to a 1986 Testarossa just to keep the injectors clean? Any brand or specific type that should be used?




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