P1316 Misfire Help!! - Land Rover Forums : Land Rover and Range Rover Forum
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post #1 of 35 (permalink) Old 11-04-2009, 03:14 PM Thread Starter
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Exclamation P1316 Misfire Help!!

Hello all, I've been chasing this issue for a long time now. My 97 Disco is misfiring and running very sluggish. I'm getting the code P1316 (misfire causing excessive emissions). This is what I've done thus far.

1. Cleaned MAF and stepper motor
2. Champion plugs and Magnecor Wires
3. Did the whole decarbon and engine flush treatments
4. Replaced cylinder heads and complete top end gasket set

I was told I had carbon buildup on my exhaust valves so instead of having a valve job done it was cheaper to buy a set of heads and I rebuilt the whole top end. I checked to see if I had a dropped sleeve but they were all good.

I also tested the coil packs by them out from a buddies 97' that runs perfect so I've eliminated that possibility. I've heard of people having the same issues so Iv'e tried all their methods with no results. Any help....DISCO MIKE I need your guidance!!!
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post #2 of 35 (permalink) Old 11-04-2009, 04:56 PM
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Try swapping out your ECU and alarm unit with his. Swap BOTH units as a set so you don't have the ECU lock you out, and try it. Just remember to clear the codes once you put everything back in his truck. I went through a similar problem and tested every sensor, traced every wire, and generally drove myself crazy until I swapped in a good ECU and alarm from a friends truck. If your truck runs right you know where you stand, if not then you need to start checking things on your truck. Start with fuel pressure to eliminate a weak pump or restricted filter and check for injector leaks. You can check most everything else with a DVOM. Then report back.
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post #3 of 35 (permalink) Old 11-05-2009, 03:52 AM
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Originally Posted by Chase6616 View Post
Hello all, I've been chasing this issue for a long time now. My 97 Disco is misfiring and running very sluggish. I'm getting the code P1316 (misfire causing excessive emissions). This is what I've done thus far.

1. Cleaned MAF and stepper motor
2. Champion plugs and Magnecor Wires
3. Did the whole decarbon and engine flush treatments
4. Replaced cylinder heads and complete top end gasket set

I was told I had carbon buildup on my exhaust valves so instead of having a valve job done it was cheaper to buy a set of heads and I rebuilt the whole top end. I checked to see if I had a dropped sleeve but they were all good.

I also tested the coil packs by them out from a buddies 97' that runs perfect so I've eliminated that possibility. I've heard of people having the same issues so Iv'e tried all their methods with no results. Any help....DISCO MIKE I need your guidance!!!

i have some similar symptoms, wicked sluggish, lots of smoke/stinky exhaust...can you hear the misfire from anywhere in particular? mine i can hear clear as day coming from the pass side ex manifold and maybe down toward the cat.
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post #4 of 35 (permalink) Old 11-07-2009, 11:36 AM Thread Starter
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Wow I really hope its not the ECU. I will try that and see.

As for the sounds I can clearly tell its misfiring, just how the engine vibrates and sputters. I also can't seem to figure out my idle issue. Sometimes when I start it it will idle at 2k-3k and some times it will idle at like 500-750 and feels like its going to stall. I've heard that the VSS can cause this. Can anyone tell me where that is located?
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post #5 of 35 (permalink) Old 11-07-2009, 08:35 PM
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The VSS is on the back of the transfer case. Look up between the parking brake assembly and end of transfer case and you'll see it and the 2 wire connector. You can unplug it and drive it to see if it makes a difference.

The ECU isn't the end of the world, plenty of good used ones available for reasonable cost. Swapping it out would at least eliminate it as the cause. From there you can check sensors with a DVOM to figure it out.

FWIW, I had a problem where my truck was running like it had jumped time and was dumping fuel into the engine. I checked every sensor, connection, and wire in the engine compartment. It turned out to be the ECU, and I confirmed it by swapping one from a good running truck.
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post #6 of 35 (permalink) Old 11-12-2009, 12:02 PM Thread Starter
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ok so I bit the bullet and took it to dealership and had them run a full diagnostics and the original code P1316 was no longer showing up. Instead It's throwing P1138- O2 problem rich. So now I'm not sure where to go from there. The mechanics told me it sounded like the fuel injectors were stuck in the full open position dumping way to much fuel (which would explain the bad fuel smell from the exhaust and terrible MPG. I'm thinking though that if there was a problem with my injectors, shouldnt it throw a code for that???

Oh and the ECU swap isn't going to work the day before I called my buddy to ask about it, he had fried his....

I saw that you mentioned switching the ECU and Alarm unit. Do they need to both be from the same vehicle. I'm asking incase it comes down to buying a new one can they be from different Discos?
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post #7 of 35 (permalink) Old 11-12-2009, 01:24 PM
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If they are out of the same truck they are sync'd to work together. If you just swap the ECU you will be able to start the truck once then it will lock you out and won't work in either truck until you have it re sync'd to the alarm unit. If you take the set together you can plug and play and no harm done. If you have someone who can sync the units to work together you can replace just the ECU. I know this because I have a locked ECU that ran my truck perfectly but nobody local to sync it to my alarm.
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post #8 of 35 (permalink) Old 11-13-2009, 07:17 PM
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How would one go about syncing the ecu to an alarm?
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post #9 of 35 (permalink) Old 11-14-2009, 05:12 AM
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The ECU and 10AS alarm unit can only be sync'd with a scanner like Testbook or Rovacom, etc. I actually contacted a vendor about the issue and they have a couple trucks they said they could install my ECU and alarm unit into, sync them and ship them back. The price was fair, I just happened on a complete setup at a bargain price. I still have the ECU I was going to send out, but I needed to buy an alarm unit anyway since mine is down near the pond somewhere.

I did ask about the possibility of having the alarm feature turned OFF in the ECU.
They stated that it had been tried but the setting never held.

If you need a GEMS ECU from a 96/early 97 NON AEL truck I'll sell mine cheap, but it needs to be sync'd by someone with the appropriate scanner.
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post #10 of 35 (permalink) Old 07-29-2010, 06:27 PM
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Originally Posted by Chase6616 View Post
ok so I bit the bullet and took it to dealership and had them run a full diagnostics and the original code P1316 was no longer showing up. Instead It's throwing P1138- O2 problem rich. So now I'm not sure where to go from there. The mechanics told me it sounded like the fuel injectors were stuck in the full open position dumping way to much fuel (which would explain the bad fuel smell from the exhaust and terrible MPG. I'm thinking though that if there was a problem with my injectors, shouldnt it throw a code for that???

Oh and the ECU swap isn't going to work the day before I called my buddy to ask about it, he had fried his....

I saw that you mentioned switching the ECU and Alarm unit. Do they need to both be from the same vehicle. I'm asking incase it comes down to buying a new one can they be from different Discos?
chase i just swapped my fuel injectors, rail, and regulator. the car seems to run better in general but now the idle is fluctuates just like you said, and now it misfires when its idleing low. it has all the same symptoms you had including P1316, P1317, and also P0300 these all say misfire. what im thinking is the computer may have saved ignition timing offset for the bad injectors and is now trying to run that offset with good injectors and misfiring. erased the codes i had and wen i restarted it i had alot of power and didnt notice the misfire. idle speed still fluxuated tho. that seems to be a new thing. ANYWAY what im trying to say is it may not be your injectors. ill have to wait and see
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post #11 of 35 (permalink) Old 07-29-2010, 09:07 PM
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Check your O2 connectors. 1317 is rough road line fault low which basically means the ECU is taken out of it's normal street mode because it will pop faults. Lambo just went through this last winter, had a bad O2 connection. As far as the idle....the adaptives need to be reset.....that's a dealer thing. There are ways around it but don't always work. I'm going to link to another post, pay close attention to the one by Tim the Enchanter; 1996 Discovery dies when ac is turned on

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The three-position Lucas switch--DIM, FLICKER and OFF.

The other three switch settings--SMOKE, SMOLDER and IGNITE.


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Contact info for Paul Grant;

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post #12 of 35 (permalink) Old 07-29-2010, 11:23 PM
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sounds like thats for carborated models aint it? o and i forgot to say the reason i replace the injectors rail and regulator was because it would misfire when hot, particularly when the ac had been on. it would have no power then stall and seem to be burning rich. once the engine started to run barely it didnt have enough power to pick up on the street and would sometimes stall, once it got going though it ran fine.
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post #13 of 35 (permalink) Old 07-30-2010, 04:32 AM
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Carburetor? Uh no.

First off, is your IAC clean? If not then this will all be a waste of time.

97 SD - Altai Silver. Sold
94 Saturn SC2

Roverless and wandering

The three-position Lucas switch--DIM, FLICKER and OFF.

The other three switch settings--SMOKE, SMOLDER and IGNITE.


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post #14 of 35 (permalink) Old 07-30-2010, 02:08 PM
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yes i did this morning with no luck. ran great until it got hot then it wouldnt start after leaving it off for a few minutes. it would misfire



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Last edited by LewisTheTurtle; 07-30-2010 at 04:48 PM. Reason: next page
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post #15 of 35 (permalink) Old 07-30-2010, 03:18 PM
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Well which is it, wouldn't start or misfire? If you make up your mind we might be able to fix this thing.

The year of the vehicle would also speed things up, so we know what system we are dealing with.
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