V40 T4, 1.9 147 KW: Ignition issues, won't accelerate

[vlitavsky]

Hi folks!

I have having issues recently with my V40 1.9 T4 1998, I was about to let my spark plugs changed because it took some time to start and I have LPG so I am changing spark plugs quite often. But after the guy replaced old with new ones I am having quite strange issues, car will not maintain rpms it wont accelerate and I am hearing strange noise from the engine:

I have changed this last week:
- Spark plugs - 2x
- MAF
- air filter
- Spark plug cables
- ignition coils 1x

I have also recorded a video of me starting my car to show rpms, issues, noise etc. Video: https://youtu.be/rFwPuIO4Td0

I am grateful for every feedback and I thank you in advance!!!

[clarkey1984]

What make of spark plugs have been used, as the t4 can be very picky with plugs that aren't genuine Volvo ones, I've never had a t4 myself but I have seen many threads on here about it.

[vlitavsky]

Currently Denso

[barrybritcher]

It could be the leads are connected up in the wrong order, easy mistake

[vlitavsky]

Thanks, I will recheck tomorrow, 1 and 4 and 2 and 3 right?

[barrybritcher]

I don't know, I dont own a t4 im afraid

[ww1dm1]

The make of the spark plugs don't matter, just make sure the specifications are right. Get genuine Volvo if you're not sure.

If you got the order wrong I doubt you would be able to start the car at all. My guess is that one of the cylinders is not working. Does it idle at all? Can you disconnect the spark plugs one by one and see if one of them doesn't contribute?

[vlitavsky]

Originally Posted by ww1dm1

The make of the spark plugs don't matter, just make sure the specifications are right. Get genuine Volvo if you're not sure.

If you got the order wrong I doubt you would be able to start the car at all. My guess is that one of the cylinders is not working. Does it idle at all? Can you disconnect the spark plugs one by one and see if one of them doesn't contribute?

Specification is right, I can start the car but it is starting quite heavily as you can see in video. It idles but rpms are jumping. I will disconnect the spark plugs - I suppose that after I disconnect one spark plug it should have impact on rpms and engine noise if spark is working correctly, right?

Another horrible scenario I have in my mind are burnt valves (

[ww1dm1]

Originally Posted by vlitavsky

Specification is right, I can start the car but it is starting quite heavily as you can see in video. It idles but rpms are jumping. I will disconnect the spark plugs - I suppose that after I disconnect one spark plug it should have impact on rpms and engine noise if spark is working correctly, right?

Another horrible scenario I have in my mind are burnt valves (

Well, if the cylinder is contributing and your car is already barely idling then it will probably stall if you disconnect a working one, simply make sure all of them are working. Since you said that this problem came up after a spark plug change, so it would be strange if it's something as bad as burnt valves. More likely to be plugs, leads, injectors, FPR, a massive vacuum leak somewhere, etc.

[vlitavsky]

Originally Posted by ww1dm1

Well, if the cylinder is contributing and your car is already barely idling then it will probably stall if you disconnect a working one, simply make sure all of them are working. Since you said that this problem came up after a spark plug change, so it would be strange if it's something as bad as burnt valves. More likely to be plugs, leads, injectors, FPR, a massive vacuum leak somewhere, etc.

Yes, that is correct, it was after spark plug change. I will check it and let you know. He told me that he had to change them twice since the first ones didnt work. So I am little bit afraid that he could have done something with valve but lets see.