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1998 V70 T5; problem hot starting & occasional brief power loss at speed

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

clifford06
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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by clifford06 » Wed Aug 28, 2019 3:16 pm

I have been suffering from the same type of " no start when hot " problem . Would a bad engine coolant temp sensor cause this problem ?



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abscate
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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by abscate » Wed Aug 28, 2019 8:17 pm

It can. You can find the ohm chart to test it buried in this forum. I think I have it referenced in my 1999 maintenance thread


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clifford06
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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by clifford06 » Fri Aug 30, 2019 4:31 pm

Thanks. I found a test procedure on Pelican Parts . Sensor should read 3.5 ohms. DME is 5 volts and .1 volts at 60 F. I couldn't get an accurate reading due to my lack of meter reading experience. But from the look of the sensor ( leakage, wire heat damage ) , I'm going to replace it with Volvo sensor. I remember changing it a few years ago with a aftermarket brand.



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abscate
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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by abscate » Fri Aug 30, 2019 7:46 pm

That’s not the right resistance. It’s between 500-5000 ohms working range.

I’ll hunt it down

viewtopic.php?f=1&t=79330&p=427389&hili ... ce#p427389


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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by clifford06 » Wed Sep 04, 2019 7:34 am

I put in a new ECT ,and still get a no start after a drive to get it up to operating temperature. Jumping the fuel pump relay does not get it going. Bad fuel pump ? If so I'll just get a replacement to buy some time. Thoughts and opinions are welcomed. This car is getting on my last nerve .



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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by abscate » Wed Sep 04, 2019 8:43 am

You really need to measure the fuel pressure. That will tell you if the pump is marginal, rather than guessing at what part is bad. There are a lot of things in a fuel delivery system, all interconnected, so guessing is expensive.

Fixing by symptom - "My car does this, what part to replace?" Quick to 'fix' then lost time rinsing and repeating.

Fixing by diagnostic - "My car does this, what sub-system do I troubleshoot? Just like the pros do.

If you want to really see the process of a guy who gets this, read shockwaves saga on his fuel pump on his XC90. He actually diagnosed a poor workmanship dealer installed fuel pump by staying with the diagnostic path.

:-)


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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by wizechatmgr » Wed Sep 04, 2019 8:19 pm

Just had 2.2k Ohms at ~70 F on my '99


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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by evdrive » Mon Sep 09, 2019 5:35 am

Update: It was the Fuel Pump Relay!
So I checked and I had last replaced the relay with a crappy KAE one. I should have realized that right away. Volvo one is the way to go with that relay always!



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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by abscate » Mon Sep 09, 2019 7:13 am

evdrive wrote:
Mon Sep 09, 2019 5:35 am
Update: It was the Fuel Pump Relay!
So I checked and I had last replaced the relay with a crappy KAE one. I should have realized that right away. Volvo one is the way to go with that relay always!
:?: :?: :?: :?: :?: :?:

Jumping the fuel pump relay does not get it going. Bad fuel pump

:?: :?: :?: :?: :?: :?: :?:

You might not be out of the woods if jumping it didn't help, but its not rare to have more than one thing wrong on old cars


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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by clifford06 » Mon Sep 09, 2019 7:28 pm

I replaced my fuel pump today with one I found on Amazon . Install was simple. I'll give it a test run tomorrow ,and see how it goes. Only thing left to change is the relay.



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