Timing Belt Job Gone Wrong... '99 S70 T5

Post by **j-dawg** » 17 May 2016, 23:19

Here's the one I'm talking about.
https://www.matthewsvolvosite.com/forums ... 3&start=20

Post by **bmdubya1198** » 18 May 2016, 07:26

j-dawg wrote:Look for an unplugged connector near your right headlight. I had tucked one away there once and spent a few days wondering why I had no spark or fuel. Plugged it in and determined conclusively that I am an idiot.

Haha, I'll take a look.

Post by **shiloh51933** » 25 Sep 2016, 19:08

I was doing a t belt, tensioner, idler,water pump and resetting the cvvt's. After job was done misfire...hmmm, I reset everything 3 times. I locked came and crankshaft with locking tools but still misfire. I'm like what the fuck? She ran perfect b4 hand, I had a WP with a bad bearing so I replaced everything with factory parts. Anyway I found 3 bad coil packs.

Post by **bmdubya1198** » 25 Sep 2016, 19:48

How does that all happen at once? Mine was an understandable screw-up. That's just a very annoying coincidence! It drives you nuts when you think you did something wrong on one job and it's a totally separate problem.

Post by **shiloh51933** » 26 Sep 2016, 06:59

bmdubya1198 wrote:How does that all happen at once? Mine was an understandable screw-up. That's just a very annoying coincidence! It drives you nuts when you think you did something wrong on one job and it's a totally separate problem.

Exactly, I was swapping in new WP and I removed one of the 2 cvvt's on my wife's '04 XC70 to replace a leaky seal and I thought I reset the cvvt wrong but everything was lined up properly. The cvvt's on my wife's '04 aren't spring loaded, there neumatic so I eventually locked cams and crankshaft. I couldn't figure out why 3 of them went, battery was unconnected while working but she did have 160k.

Post by **pvfjr** » 26 Sep 2016, 16:08

bmdubya1198 wrote:Mine was an understandable screw-up.

So did you ever get it running? What was it?

Post by **pvfjr** » 26 Sep 2016, 16:11

shiloh51933 wrote:
bmdubya1198 wrote: I couldn't figure out why 3 of them went, battery was unconnected while working but she did have 160k.

I just had to replace 2 coils on my 99 S70. It was a project car than ran fine until the PO overheated it and blew the headgasket because he didn't keep his leaky radiator topped off.

I replaced one coil due to a misfire, and the car ran fine until it warmed up, then another coil went bad.

Maybe the overheating of the engine was too much for them to bear.

Post by **bmdubya1198** » 26 Sep 2016, 16:52

pvfjr wrote:
bmdubya1198 wrote:Mine was an understandable screw-up.
So did you ever get it running? What was it?

Yes, the car is running better than ever now (other than some constant clicking from the top end that I think is unrelated)! It turned out the CVVT hub had failed. We replaced it and got it running, but it was misfiring on 2 cylinders. After a bunch of testing injectors, coils, etc. I fine-tuned the adjustment on the exhaust cam sprocket to make sure everything was lined up as precisely as possible, and it was still missing. After 3 days of us two morons messing with every little thing, we ended up swapping the first and second coil wires and everything instantly smoothed out.
The lesson here was to always check firing order, even if you think you know it's right. Distributor ignition systems are so much easier...

Post by **abscate** » 27 Sep 2016, 03:55

Thread closure..the colour assignments for the coil on plug wires are documented in the wiring diagrams and in this thread

...and to MIJ....page 5 - he totally nailed it.

Btw, have you made sure your ignition order is correct? I think even with ignition packs it would be possible to get a couple out of order...that may be all that's wrong.

Post by **bmdubya1198** » 27 Sep 2016, 07:23

I've already had to quote them once!

Timing Belt Job Gone Wrong... '99 S70 T5

Re: Timing Belt Job Gone Wrong... '99 S70 T5