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1998 S70 T5 turned into a brick

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dspran
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Re: 1998 S70 T5 turned into a brick

Post by dspran » Mon Jul 09, 2018 4:57 am

precopster wrote:
Mon Jul 09, 2018 12:50 am
The fact it starts on starter fluid means it has to be a fuel issue.
Agreed. Is there a better way to check injectors than a test light? I have pressure at the rail, and good readings on cam and crank sensors per Chilton/Haynes and a couple of older posts on this site

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Re: 1998 S70 T5 turned into a brick

Post by SuperHerman » Mon Jul 09, 2018 12:37 pm

In what manner did you confirm you have fuel pressure? How did you confirm your pump is working? Have you put a fuel pressure gauge on the fuel rail?

Dumb question - how long has the fuel filter been in service? Could you have messed something up here?

Can you flush out with more detail your testing of the tank to fuel rail delivery?

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Re: 1998 S70 T5 turned into a brick

Post by dspran » Mon Jul 09, 2018 5:42 pm

SuperHerman wrote:
Mon Jul 09, 2018 12:37 pm
In what manner did you confirm you have fuel pressure? How did you confirm your pump is working? Have you put a fuel pressure gauge on the fuel rail?

Dumb question - how long has the fuel filter been in service? Could you have messed something up here?

Can you flush out with more detail your testing of the tank to fuel rail delivery?
Fuel filter is very close to new. This is the only shoddy troubleshoot that has been done, pressure was checked at the fuel rail with the tip of a screwdriver first, convincing me I had good pressure. Not having a fuel pressure gauge I checked it with a tire pressure gauge. I know it’s not ideal but I’ve got 45ish if I recall

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Re: 1998 S70 T5 turned into a brick

Post by SuperHerman » Wed Jul 11, 2018 6:20 pm

Could be an immobilizer issue - on the later models more common. Not sure how to verify.

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Re: 1998 S70 T5 turned into a brick

Post by dspran » Wed Jul 11, 2018 7:20 pm

SuperHerman wrote:
Wed Jul 11, 2018 6:20 pm
Could be an immobilizer issue - on the later models more common. Not sure how to verify.
Talked to a local euro car repairer, he suggested maybe the chip in the key was expired, to try spare key. Did so, no change. Pulled key switch apart and cleaned contacts, got the alarm to go off after everything was put back together. Lol no change there either. Everything I see says immobilizer wasn’t used on the 98. This weekends plans are to start over from the OP. Put it back in the air and check anything that was touched for the half shaft/brakes and then verify readings on all the sensors. I have verified the sensors are reading right, but maybe those values aren’t making back to the computer due to bad circuitry. I hate to throw this car away so I’m going to have to keep digging. It will have to involve a scanner that provides live data. My thought is if the computer isn’t getting the signals I am getting, either I have a bad wire or the computer is junk. It has been to doggone hot to spend much time looking into it. I appreciate all the responses and will update when I come up with something conclusive

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Re: 1998 S70 T5 turned into a brick

Post by abscate » Thu Jul 12, 2018 6:45 am

Everything I see says immobilizer wasn’t used on the 98
Definitely you have an immob on a 1998
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Re: 1998 S70 T5 turned into a brick

Post by SpookyDuchess » Fri Jul 13, 2018 12:54 pm

Hey there, this is my first post, as i have been lurking for quite a long time here. Anyway, i used to have a 96 850T5 that would do that exact thing, and also had a 99 S70T5 that would start fine until it got to operating temp, then would not start again until completely cooled off, but would start with spray assistance. Point being, in BOTH cases it was the FPR. The fuel pressure regulator was the last thing i replaced the first time it happened with my 850 wagon, but, the second time with the S70, i replaced it second after the fuel pump. Have you checked your FPR?

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Re: 1998 S70 T5 turned into a brick

Post by dspran » Sun Jul 15, 2018 12:57 pm

SpookyDuchess wrote:
Fri Jul 13, 2018 12:54 pm
Hey there, this is my first post, as i have been lurking for quite a long time here. Anyway, i used to have a 96 850T5 that would do that exact thing, and also had a 99 S70T5 that would start fine until it got to operating temp, then would not start again until completely cooled off, but would start with spray assistance. Point being, in BOTH cases it was the FPR. The fuel pressure regulator was the last thing i replaced the first time it happened with my 850 wagon, but, the second time with the S70, i replaced it second after the fuel pump. Have you checked your FPR?
The only thing I see resembling a fpr is on the passenger side of the fuel rail, underneath, and it doesn’t appear to have a lines or wires going to it, just plugged into the rail.

After retracing my footsteps, I’ve got battery voltage at both 2 and 3 on the cam position sensor wiring. 2 should be around 5 volts? 35 ohms on pin one. Naturally with the key on

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Re: 1998 S70 T5 turned into a brick

Post by misha » Sun Jul 15, 2018 1:24 pm

dspran wrote:
Sun Jul 15, 2018 12:57 pm
...The only thing I see resembling a fpr is on the passenger side of the fuel rail, underneath, and it doesn’t appear to have a lines or wires going to it, just plugged into the rail.
That is a fuel pressure damper.
Fpr is somewhere in steering rack area or behind passenger side rear wheel...around fuel filter...depending which engine management the car have.
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Re: 1998 S70 T5 turned into a brick

Post by dspran » Tue Jul 17, 2018 8:07 pm

Update: Went to the local salvage yard today and grabbed a handful of relays and the ecu. Ecu made no change, changed out the relay(timing advance)? driver side above the radiator, I finally got a sputter, then nothing. I was like WTF? Traced vac lines, found one on the back of the engine, driver side. It was deteriorated, I spun it 1/4 turn and the brick fired, ran smoother than ever before. I will be replacing said vac line. I appreciate all the comments and advice. If there is a Volvo Master Tech out there that can comment on this, that would also be appreciated. Someone, sometime will google this and it may help them along the way.

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