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1991 volvo & all 4 spark plugs are being hit by pistons

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They are too long for that head they may fit i use to see them hit in old dodge 318 wide blocks when purchasing different brand plugs measure the ends from oem equipment

Posted on May 09, 2009


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"98 Volvo V70 2.4L 20 Valve no turbo. Timing jumped on previous owner bought car for steal. both cams turn freely, exhaust does have quite bit more resistance. With the timing belt off and spark plugs out...

These are interference engines. If the timing belt was never replaced and the car has over 120000 miles on it, I bet the belt broke and then the pistons hit the valves and you have trouble.

Without spark plugs in, you should be able to use a large wrench to turn the engine. If there's any resistance, you probably have a piston touching a valve.

What I would do is to remove the valve cover and possibly the cams, then with all the valves closed, see if I can turn the crank over.
You might be able to get a small inspection camera down the spark plug holes to look in the cylinders, and maybe even with all the valves closed do a leak-down test to see if the valves are sealing.

If you can get all the valves to seal, they're not bent or broken AND the pistons are sealing well (meaning, no holes in them). Then you could adjust the timing and put a new belt on it and see if it runs.

Actually - that might be the best way to start. Align the cams and put a belt on, then rotate the engine to where you can leak-down test each cylinder. Any big leaks and you have a problem.

A used engine might be a good idea, but I'd verify there's a problem first. You CAN get lucky and the belt broke when the engine was started and nothing got damaged.

Dec 04, 2014 | 1998 Volvo V70

1 Answer

How to change speed sensor

The speed sensor or crank sensor as called by other vehicles is on the rear pass side. Follow a black wire that looks like a spark plug wire. It has a connector and 1 bolt where it attaches near trans. Well known for failing and no spark.

May 20, 2014 | 1991 Volvo 240

1 Answer

1991 volvo 740 B230 engine spark plug diagram.from dist. to plugs

try going to and go to their 700/900 F.A.Q. section, you will find what ever you need theiir, good luck

Oct 12, 2010 | 1991 Volvo 740

1 Answer

Cuzn pulled all spark plug wires out without numbering them.. now i don't know where they go. i have a 91 volvo 740 2.3 4 cylinder.. HELP???

Cousins are fun! Is this a "distant" cousin? lol I feel your pain.

For the 2.3L SOHC AND 2,3L SOHC TURBO:

Let me know if this helped...or if you have additional information of questions. Feel Free to contact me at FixYa.Com!

Mar 16, 2010 | 1991 Volvo 740

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Firing order for Spark Plug wires

Here is the diagram you ask for. While it says it is for the 3.0L V6, it is the same for the 4.0L V6 if that's what you have...


Feb 15, 2010 | 2004 Ford Ranger

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I have a 1991 Hyundai excel and one of the pistons doesn't fire

Have you measured the compression? Very low compression can be the reason. And the reason for low compression can vary - broken compression ring, worn valve/valve seat... You are sure you are getting a spark, just before the spark plug, right? Have you checked the timing of ignition?     

Nov 10, 2009 | 1991 Hyundai Excel 4 Door

1 Answer

1991 volvo 240 distributor doesn't turn when engine is cranking.

I believe this a belt driven engine right? Check the timing belt.

Mar 06, 2009 | 1991 Volvo 240

1 Answer

No spark at plugs on my 1991 volvo 240

Did you replace the plugs? How hot is the spark from the coil thin and blue? if it is big and orange it is a weak coil and should be replaced. If it is good try an other wire from a different car (do not put a spark plug in it) and see what the spark looks like if good put the plug in it and check the spark again if this is a good the wires are bad

Mar 06, 2009 | 1991 Volvo 240

2 Answers

Firing Order Diagram

the firing order is

Jul 23, 2008 | 1991 GMC C1500

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