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Ticking and Smoking After Leaky Injector Install

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
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logscool
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Ticking and Smoking After Leaky Injector Install

Post by logscool » Sun Apr 14, 2019 7:20 pm

So a while ago a shop replaced the cylinder 2 injector as it wasn't functioning. The other day I noticed that it was the older style injector with the large body and the rest were the newer style orange ones.

I purchased a set of cleaned and supposedly tested and flow matched injectors from ebay. Installed them and started up the engine. Engine ran terrible and I shut it off. Pulled the injector rail back out and noticed cylinder 1 injector was leaking. I replaced it with one of the old ones. This improved the roughness but there was still a loud and noticeable tick. I put all the old injectors back in as they were working well. The loud ticking remained I figured it was just from the cylinder being washed with fuel and that it would oil itself up. I drove around the block and white smoke was coming out the tailpipe.

What did I do to my car?

I've tried unplugging injectors at idle and each one makes the engine miss and get worse when I pull it so I know they are all functioning. I also pulled the spark plugs and put about 2 teaspoons of oil in each cylinder in case it was a compression issue but this did not fix it.



logscool
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Re: Ticking and Smoking After Leaky Injector Install

Post by logscool » Sun Apr 14, 2019 9:02 pm

Alright it seems I may have been overly concerned and dramatic. I drove it around some more and let the engine warm up and it all seems fine now. I think the white smoke was just all the fuel that had been dumped in from the leaky injector still being burned in the exhaust.



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Re: Ticking and Smoking After Leaky Injector Install

Post by logscool » Thu Apr 18, 2019 10:19 am

Just thought I'd post another follow up. The engine now makes a slight ticking noise when cold but it pretty much completely goes away when warmed up. I changed the oil and did a compression test on the engine. Cylinder 1 was at about 185-190 psi while the other cylinders are mostly around 210 psi.

Might try and get the engine checked out for a professional opinion on what the ticking is. Worried it might be a slightly bent rod as @JimBee found in his rebuild of a hydrolocked engine.
https://www.matthewsvolvosite.com/forum ... =1&t=75068



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Re: Ticking and Smoking After Leaky Injector Install

Post by tardcart » Thu Apr 18, 2019 11:08 am

forget it, ticking is normal. In the owners manual it even says ticking or up to 15 minutes is completely normal. You can't hydrolock with a leaky injector. You cant have 200 lbs compression unless ¥ou have a diesel. You are not supposed to start the engine for a compression check, at cranking speed only with plugs out.



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Re: Ticking and Smoking After Leaky Injector Install

Post by RickHaleParker » Thu Apr 18, 2019 11:28 am

tardcart wrote:
Thu Apr 18, 2019 11:08 am
You are not supposed to start the engine for a compression check, at cranking speed only with plugs out.
Dynamic compression test and Snap Throttle compression test are done with the engine running.


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Re: Ticking and Smoking After Leaky Injector Install

Post by logscool » Thu Apr 18, 2019 11:33 am

I think the injector was actually just straight stuck open. Hope you are right though. I ran compression test with engine warm and cranking the engine with fuel system disabled and plugs out. Service manual says 189-219 psi is the spec for this engine.
http://www.volvotips.com/index.php/850- ... ce-manual/

The ticking is definitely something that wasn't there before. I'll probably just keep running it and get it checked out if it continues.



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Re: Ticking and Smoking After Leaky Injector Install

Post by tardcart » Thu Apr 18, 2019 12:33 pm

I was wrong it looks like, do they difererentiat for turbo and NA, which has higher compression?



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Re: Ticking and Smoking After Leaky Injector Install

Post by Sommerfeldt » Thu Apr 18, 2019 12:36 pm

tardcart wrote:
Thu Apr 18, 2019 11:08 am
forget it, ticking is normal. In the owners manual it even says ticking or up to 15 minutes is completely normal. You can't hydrolock with a leaky injector. You cant have 200 lbs compression unless ¥ou have a diesel. You are not supposed to start the engine for a compression check, at cranking speed only with plugs out.
Dude, stop.

Ticking for 15 minutes? Everything will be warm and to spec in less than 10, and if you don’t have oil pressure enough to not hear ticking inside the car in 30 seconds, or so, you better shut it down.

You can have 200 psi without a diesel. As OP says, manual says up to 219. As RHP says, there are compression tests done with engine running. Not that OP did that, but you can’t just throw statements like these around.

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Re: Ticking and Smoking After Leaky Injector Install

Post by tardcart » Thu Apr 18, 2019 12:57 pm

calculated for 13.5 compression ratio is only 198psi with zero leak down. dont see how you could get over that. /Users/chriskeep/Desktop/HPIM5348.jpg



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Re: Ticking and Smoking After Leaky Injector Install

Post by tardcart » Thu Apr 18, 2019 1:03 pm

tried to put pic of manual in but failed, where it said when cold 15 minutesticking is perfectly normal. what is the trick to putting pics up?



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