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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

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

Post by wizechatmgr » Sun Sep 22, 2019 10:51 pm

My suggestion would be a noid light on the fuel injectors to verify they are being called to squirt. Are you getting spark during these issues?


Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD - ~183k miles

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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 » Mon Sep 23, 2019 5:27 am

Yes, spark good. Fires on ether.


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1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW

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

Post by wizechatmgr » Mon Sep 23, 2019 6:54 am

Time to tie a fuel gauge to the wiper for a while until the pressure can be figured out. Could be a volume delivery issue after the pump gets hot.


Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD - ~183k miles

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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 » Mon Sep 23, 2019 10:21 am

Yeah , this is a tough one, but we have Texas on it, and wait until he finds out Bosch fuel pumps were made in Alamo...


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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 » Mon Sep 23, 2019 3:52 pm

Doing my best to figure solve this issue . I just read a post about ECU " re-learn ". Is this something to give a try or would having the battery disconnected during cable replacement be the same ?



Dtp367
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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by Dtp367 » Tue Sep 24, 2019 10:01 pm

I am having same problem i think. 96 850 glt non turbo. I was misfiring on all cyclinders, found ground wire connected to battery but disconnected from something else, fixed ground and no more misfire. Runs good but sometimes on hot start she will sputter and eventually even out.

Thinking was ect and thermostat, sensor is off making her run hot. The heat could be messing something else up. First time posting, you guys have helped me out a lot so thank you. Still trying to solve this on my 850.



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erikv11
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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by erikv11 » Tue Sep 24, 2019 10:58 pm

Dtp367 wrote:
Tue Sep 24, 2019 10:01 pm
.... Still trying to solve this on my 850.
Let us know if you do!


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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

Post by clifford06 » Wed Sep 25, 2019 4:55 pm

abscate wrote:
Mon Sep 23, 2019 10:21 am
Yeah , this is a tough one, but we have Texas on it, and wait until he finds out Bosch fuel pumps were made in Alamo...
Is that why they smell like tequila when you open the box ! LOL !!



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

Post by clifford06 » Wed Sep 25, 2019 5:37 pm

Okay , now its time to get a list of parts that are effected by heat during hot start . Meaning things that adjust due to temperature on hot restart , like fuel pump , ECT . I've changed fuel pump ,ECT , antenna ring , jumped fuel relay . Same result on hot start. No start . I have a cam and timing sensor from a salvage yard run a while back . Hoping to avoid a ECU replacement .
Suggestions are welcomed !



clifford06
Posts: 340
Joined: Thu Aug 01, 2013 5:03 pm
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Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by clifford06 » Tue Oct 01, 2019 7:33 pm

Okay guys, been tending to " wife honey do's " to keep the peace . Time to get this resolved . I'll test my cam and timing sensor. I'm using a Actron cp7665 meter . Can anyone let me know the settings to do the test and what my readings should be ?



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