Question about Cars & Trucks

2 Answers

The vehicle is backfiring through the exhaust and won't rev up.

16 Valve twin overhead cam. Engine Code 178D Vin AFZ178F

Posted by on


2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Cars & Trucks Master
  • 813 Answers

Hi,I dont know if this is a timing belt or timing chain,
but if it is the belt drive timing belt then its possible that it has slipped a couple of teeth so that when it fires on a serton cylinder when one of the exurst valves is still open cousing it to back fire through the exurst,
I would first set up the engine timing,make shore that the mark on the crank pully is lined up with the pointer thats on the engine block then make shore that the cams are both lined up with the marks on the head,if ok,then you can adjust the ignition timing,
you will already have it at top dead centre by sorting out the engine timing,so take the distributer cap off the rotor should be pointing at the number 1 cylinder so it should just be ready to fire,if that seems to be lined up ok,its not your timing.
so you will have to do a engine compression test to see if there is eneything wrong with the valves or piston rings(most of the time its the problem with the head)if thats ok,then it must be to do with a fuel problem if you have a good spark from sparkplugs.
all the best,hope this got the brain cells working hard so you can get to the bottom of the problem.

Posted on Apr 17, 2015

  • Dawn Byrne
    Dawn Byrne Apr 18, 2015

    Thanks for help. Now misfiring on no. 3 cylinder. Any ideas?


  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has achieved Level 3.

  • Master
  • 369 Answers

Back firing indicates a number of things but usually an over advanced timing system. Have you had the timing checked?

Posted on Apr 17, 2015

Testimonial: "Thanks for help. Now misfiring on no. 3 cylinder."


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Hi trying to set the timing on my j1 elantra its a 16 valve and each cam has two marks on my question is what positions should the cam lobes be at when timing is supposed to be correct.thanks

no 1 piston tdc
the cam lobes for no 1 piston should in such a position so that a slight turn of the cam shaft one way makes the exhaust start to close and the inlet start to open or the other way the inlet start to close and the exhaust start to open
this is known as valve rock or valve overlap and occurs when the cam shaft is properly timed to the tdc position of the piston
for a twin cam engine the cam lobes position will be the same operation just that the inlet cam rock will be for the inlet cam and the exhaust cam rock will be for the exhaust cam

Dec 29, 2016 | Cars & Trucks

1 Answer

How to install timing chain with timing marks both crankshaft and camshaft

Hellen, For the second time, Re POST year, make, model, engine size and complete question so we, here at fixya can answer your question effectively.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Still pulling hair Twin Cam timing marks How accurate Engine Exhaust...
16v fast tbelt swap
Twin cam 16 valve timing marks Google Search

Aug 11, 2016 | Cars & Trucks

1 Answer

How do i tell the difference of a 2.2 or 2.4 engine?

The eighth digit in the VIN number - a code 4 is a 2.2 and a code T is a 2.4 engine.
The 2.2 is an overhead valve engine, the 2.4 is a double overhead cam engine.

Jul 25, 2012 | 1997 Chevrolet Cavalier

1 Answer

Where is the starter relay on a 98 ford explorer limited edition 6 cylinder 4.0? My book says on the fender next to battery but it is not there

The information you have is correct. The POSITIVE battery terminal connects to it. Just follow the battery cable and you will find it.

There are two different 4.0L V-6 engines used in Ford Explorers in the 1998 model year.
One is a Dual Overhead Cam (DOHC) engine. (VIN code "U")
The other is and Overhead Valve engine (VIN code "X")

What "VIN code" means is that the 8th digit of your VIN will be either a "U" or an "X". The 8th digit in the VIN identifies the engine that the vehicle is equipped with. You may want to use this information anytime you are talking about your truck or trying to get information or parts. These two engines are COMPLETELY different, so it can save you a lot of frustration if you give the correct information. Otherwise someone may just "assume" it is one or the other and you will get incorrect information or wrong parts.

Anyway, the actual location of the starter relay is the same for BOTH engines. The only difference is the type of cable hook-up that is on them. (see pictures below)



Jul 28, 2011 | 1998 Ford Explorer

1 Answer

Good Morning, I am in need of a serpentine belt diagram for a 2000 ford taurus, 3.0L W/ air condtioning. could someone please help me with this? thank you in advance.

Well, there are actually two different 3.0L engines used in a 2003 Mercury Sable. One is an Overhead-Valve (OHV) type engine. The other is a Dual Overhead Cam (DOHC) 24-valve engine. You can tell the difference by just looking at the engine or by checking the 8th digit in your VIN. For the OHV engine the 8th digit of the VIN will be a "U" and the DOHC engine will be an "S".

This is important information when it comes to getting parts or information for your vehicle.

Anyway, I have provided belt routing diagrams below for BOTH of these engines.


Jul 23, 2011 | 2003 Mercury Sable

1 Answer

How do you m,ake sure that the camshafts in a 16 valve overhead cam in kia rio are timed correct i had them out and not sure hot they go , both pin up both pins down or 1 of each thanks

you will need a special tool to lock cams together when refitting the belt ,look at the cam lobes and this will tell you both valves on no1 will be closed on TDC no1 the lobes will point up and outwards with the exhaust getting ready to open next ,then look for the marks as i honestly cannot remember where they are as when i do any engine i turnt to TDC no1 and mark with white paint ,but twin cams need a special funny sort of tool to hold then in place ,if you dont have this tool then use a couple of pairs of molegrips WHATEVER YOU DO MAKE SURE YOU TURN ENGINE OVER BY HAND 360? to ensure valves are not hitting the pistons

Nov 30, 2010 | Kia Rio Cars & Trucks

1 Answer

Trying to locate engine number to determine 16 0r 32 cam

Unfortunately, your question is very vague and hard to understand.

16 or 32 cam?
Usually your engine will have twin cams, or single cam.
Overhead cam(s) or not. You could determine if your engine
is a 4 or a 6 cylinder, and then you will generally find out how
many valves the engine has.

If you are in a 4 cylinder car, you probably have 16 valves if you have a twin cam engine.
If you have a single cam, 4 cylinder engine, then you will usually have only 8 valves.

The only way that you could end up with 32 valves, is if you have a dual overhead cam, v-6 engine.
Each head will have two cams, and each cylinder will have 4 valves then.

I hope that this is what you were trying to ask. :)


Oct 13, 2010 | 2003 Dodge Durango

2 Answers

I have a 2001 ford focus SE is my engine is a single or dual cam?

Look at the 8th digit on the vin #
3 = Duel
P = Single

Oct 02, 2010 | 2001 Ford Focus

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

68 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

80531 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

john h

Level 3 Expert

15360 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides