Question about Volvo S40

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I did my cylinder head and put it back but my car is not starting i think i might have made wrong cam timing because its backfiring on the throttle its a volvo s40 2l engine need help fast

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  • Volvo Master
  • 1,043 Answers

Did you remove the dist. while replacing the head if so you may have dropped the dist back in 1/2 tooth off on the timing and that would cause the engine to back fire. You need to bring #1 piston to the top of the cyl. and then make sure the rotor in the dist is pointing to #1 spark plug wire on the dist. cap and then drop the dist. You may need to turn the oil pump shaft to align the dist before dropping it onto the oil pump shaft. You can do that with a screw driver.

Posted on May 20, 2017

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: head bolt torque specs and timing marcs for a 94 volvo 960 6cyl

you do 14 foot pounds then 45 foot pounds then a 120 degree turn.if aluminum heads are what you have

Posted on Nov 18, 2008

  • 123 Answers

SOURCE: car won't start, little backfire through throttle body

water in the gas?
lose wire in the plugs
fuel filter is dirty
auto choke is stuck
What?????????

Posted on Apr 22, 2009

polarcycle
  • 1392 Answers

SOURCE: had the head redone, new Carb fitted, new

Sounds like you have your timing off. If it is backfiring, that means that 2 of your wires are crossed, causing the plugs to fire on the exhaust stroke versus the compression stroke. Recheck your timing.

Posted on Jun 07, 2009

  • 73 Answers

SOURCE: 2000 volvo S40. Changed timing belt, engine will not start.

WELL WHAT YOU NEED TO DO FIRST IS MAKE SURE THAT YOU PUT THE TIMING BELT EXACTLY WERE IT GOES THERE ARE TIMING MARKS IN THE ENGINE IF MAKE SURE THEY ARE WERE THEY NEED TO BE

Posted on Jul 26, 2009

ghost45
  • 1280 Answers

SOURCE: I own a 2004 accent with 122,000 km on it. Long

P0340 - Cam Timing

SYMPTOMS/CONDITIONS
of a mistimed camshaft system (all must apply):

  1. Camshafts have previously been removed from the engine.
  2. Engine runs rough.
  3. Vehicle sets P0340 (camshaft sensor code).
  4. Camshaft sensor has been checked with a known, properly operating camshaft sensor.

CORRECT:
The diagram in the manuals should show the timing marks on both cam gears to be on the blue timing chain links.

ghost45_11.jpg

Posted on Mar 26, 2011

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The carb on my 350 chevey engaine is one i never seen it got wires running to the jets it started to pop and catch fire what can i do


Rick may have placed his question in the wrong category but I'll give it a shot... First, Rick, I'm going to have to presume the 'carb' is actually a throttle body and the wires are going to the injector spray nozzles on the top of the 'carb' throttle body.
If your engine is backfiring through the throttle body it can mean one of three things,
!.) First if it runs, or even won't run, double check the spark plug wires to make sure #1 wire goes to the #1 cylinder and the rest are to the correct cylinders too. Just two wires crossed will backfire through the intake with flames. For referencing which is where, The #1 cylinder on 350 small block Chevy is the forward most cylinder on the drivers side of the engine. The cylinder behind #1 is the #3 cylinder the #5 and #7 on the drivers side. The #2 cylinder is the forward most cylinder on the passenger side with #4 behind it then #6 and #8 in the rear. The firing order for all Chevy V-8's is as follows; 1-8-4-3-6-5-7-2. Looking at the engine from the front of the car the #1 cylinder tower on the distributor cap is usually at the 5 o'clock position or pretty close to it. The distributor rotates in a clockwise direction.
2.) The second condition could easily be the distributor timing is off. If you haven't turned the distributor any then that isn't the problem. If it runs double check the ignition timing for accuracy.It should read between 8 - 12 degrees advanced.
3.) Lastly, and this may be difficult to swallow if it's true but here goes. You could have either a sticking intake valve or a flat cam lobe on one of your cylinders. To check this pull the wire off the distributor cap and put it back on one by one to see if the engine runs differently with it off. If no change if found that is your failing cylinder to investigate. By that I mean to check the compression reading on that cylinder.
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Dec 06, 2016 | Chevrolet Cars & Trucks

1 Answer

Runs good cold,runs bad when it warms up


misfire is bad timing
check cam time.
check spark timing.
bad timing causes backfiring..

did you put the spark wires back like you found them or better the correct firing order? if not it backfires.
last is lean backfire.

Jan 07, 2014 | 1995 Toyota Camry

1 Answer

88 bmw m5 will not start after cylinder head replacement, backfires through intake any ideas???


any time an engine that was taken apart and put back together backfires, the first thing to do is double or triple-check the timing.

Feb 16, 2013 | 1988 BMW M5

3 Answers

I replaced my cylinder head gasket.after putting everything together,i tried to start it but it won't.it cranks and backfires. i double checked everything and timed it several times by positioning the...


well try removing the distributor and spin it around half way 180 degrees then try. it seems you are off there are two ways to install the distributor because two turns for the crank equal one for the distributor.if still wont start call on me again i will help you .

Nov 14, 2010 | 1998 Chevrolet K1500

1 Answer

The reason I'm checking the timing belt is that there is mis-fire in 1 & 2 cylinder. If the firing order is 1,2,3,4. I have continues fire out of 1 & 2, when plug wires are pulled out of head. 3...


unplug the fuel injectors, check the olhms on all. the readings should all be the same, around 11-11.5 olhms. Any readings that are higher is a sign of a bad injector which is what your problems sounds like., putting to much fuel to a cylinder causing different fuel amounts to each cylinder and causing it to backfire out of the throttle body , excess fuel . Also remove the throttle body and clean with cleaner and a toothbrush after replacing any injectors. Or there's a simpler answer and that the cambshaft is worn-out/round causing the lifters not to open enough to let in all the fuel. A worn belt would not cause misfires only on select cylinders but rather jump timing, slipping a notch on a gear and possibly bending a valve or valves and this cause a loud clacking or a really a sign to quit running the motor because it's broke! Good luck.

Oct 16, 2010 | 2004 Kia Rio

1 Answer

1992 f150 back firing throu intake when cracking throttle breifly-soundslike only one cylinder backfire. stock engine-5.8lw(efi) with headers and roller cam, engine recently rebuilt


backfire is the igniting of fuel in the intake. Can be, timing, valves not adjusted right, cam worn flat on one lobe are usually the first places to look.
check it out.

Apr 15, 2010 | 1999 GMC Jimmy

2 Answers

96 jeep cherokee backfire through throttle body


I am going to take a stab at this....as I think you may have a head gasket that has blown out. The head gasket will cause a lil white smoke, and make idling extremely rough. Sometimes water will fill up in the top of the cylinder in the compression chamber when this leak, even minor occurs. That would explain some of the compression issues. Obviously with no compression it will not run properly or even fire if there is water vapor pentrating into chamber mixing with fuel giving you that white smoke/steam.

These are somewhat time consuming to change, but not difficult. The backfiring is caused by the computer trying to compensate for the firing issue. The computer when you change the head gasket is easy to fix. After repairng gasket, try to start the car a few times but not allowing it to run as it will just continue backfiring. Turn key off, let the vehicle set about 30 minutes or so, then go back and the vehicle should run properly again.

Let me know,

Chip

Apr 11, 2010 | 1996 Jeep Grand Cherokee

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