[P1399] Engine misfire, what else to do?
#1
[P1399] Engine misfire, what else to do?
Hi all,
Been having engine problems lately and am looking for some pointers on what to do. Running out of clues myself.
I own a December 1999 S2000 with ~196K km (little under 120K miles) on the clock. In January this year I had some maintenance done to the engine, after which issues slowly started building up (or so it seems). What was done at the time was the following;
Got a ODBII reader and red the DTC's. Turned out to be P1399 and P0301. Obviously I contacted the person that did the maintenance, who has been every so helpful! Got loads of great suggestions and helped assist with a couple of things. Additionally used some of the misfire threads here on the forum.
What was done to fix/diagnose the issue?
My maintenance guy suggested that it could be;
In case of any trolls, yes I didn't change the blinker fluid.
Been having engine problems lately and am looking for some pointers on what to do. Running out of clues myself.
I own a December 1999 S2000 with ~196K km (little under 120K miles) on the clock. In January this year I had some maintenance done to the engine, after which issues slowly started building up (or so it seems). What was done at the time was the following;
- Replace TCT for a OEM refurbished one
- Replace valve retainers with AP2 ones
- Changed oil (5W40 full synthetic, Kroon Emperol) and OEM oil filter
- Adjusted valve clearance
Got a ODBII reader and red the DTC's. Turned out to be P1399 and P0301. Obviously I contacted the person that did the maintenance, who has been every so helpful! Got loads of great suggestions and helped assist with a couple of things. Additionally used some of the misfire threads here on the forum.
What was done to fix/diagnose the issue?
- Swapped spark plugs (current ones are OEM NKG, in for 7000km) and replaced them. > No change.
- Swapped coil pack cylinder 1 to 4. > No change.
- Adjusted valve clearance. > No change.
- Injector cleaner in my tank. > No change after driving ~200km.
- Changed oil for 10W40 full synthetic (Kroon Emperol). > Engine runs smoother, other than that no change
- Swapped TCT with different refurbished OEM. > No change.
- Swapped injectors of cylinder 1 and 2. > No change.
- Did a compression test > 185 cylinder 1. ~195 on cylinders 2 through 4.
- Engine runs 'raw' at higher revs (I'd say Subaru like sound) after 3000~3500RPM. Guessing sound of misfire
- Ticking (guessing TCT) coming and going at idle and low revs. Video with sound
- Before changing the oil from 5w40 to 10w40 I did a check on oil level. Noticed that the car drank quite a lot of oil. It didn't do that before?
- Flashing CEL under load (you can clearly hear misfire).
- Today, after warming up, the oil light lit at idle. It's actually flickering. Reving the engine makes it go. > This is what scares me.
- When warn, trying to start the engine, it turns over difficult.
My maintenance guy suggested that it could be;
- Bad oil pump.
- Damange to the bearings (guessing rod bearings).
In case of any trolls, yes I didn't change the blinker fluid.
Last edited by vwaart; 04-22-2018 at 09:15 AM. Reason: added some details
#2
Small update. Started the car again last night (engine was cold).
Fired up instantly, no problems turning over. Sounded ok, not rattle. Waited for the car to go off the choke, after which I slowly increased the throttle a couple of time. CEL lit up, so I read the values
Fired up instantly, no problems turning over. Sounded ok, not rattle. Waited for the car to go off the choke, after which I slowly increased the throttle a couple of time. CEL lit up, so I read the values
- P0300, P0301 and P0302. > This is after it ran extremely shitty earlier today and after I switched the injectors in the morning.
#3
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Small update. Started the car again last night (engine was cold).
Fired up instantly, no problems turning over. Sounded ok, not rattle. Waited for the car to go off the choke, after which I slowly increased the throttle a couple of time. CEL lit up, so I read the values
Fired up instantly, no problems turning over. Sounded ok, not rattle. Waited for the car to go off the choke, after which I slowly increased the throttle a couple of time. CEL lit up, so I read the values
- P0300, P0301 and P0302. > This is after it ran extremely shitty earlier today and after I switched the injectors in the morning.
If it is drinking a lot of oil (smoking a lot), this can cause misfires as well....did any of your plugs have oil on them?
#4
Thanks, appreciate the response! I'm not too sure about the oil now. It actually doesn't smoke at all! I check my rear view mirror when revving up, not a puff. Actually ordered a pack of brand new coils today, will pop them in when I get them later this week. This is weird stuff. Will post an update.
#5
Did you guys check your coil packs closely too see if they were wet with oil? If your spark plug hole gaskets have never been changed inside your valve cover then they will definitely flood oil into the coil packs chambers causing misfires and killing the coils. Change them out with OEM replacement ones and swop the coils with the new ones to see if that cures the problem - I'm sure it will unless that oil pump really has gone bad...
#6
Did you guys check your coil packs closely too see if they were wet with oil? If your spark plug hole gaskets have never been changed inside your valve cover then they will definitely flood oil into the coil packs chambers causing misfires and killing the coils. Change them out with OEM replacement ones and swop the coils with the new ones to see if that cures the problem - I'm sure it will unless that oil pump really has gone bad...
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HawkeyeGeoff (04-24-2018)
#7
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#8
Every single time this comes up people say plugs and coil packs. Inevitably the OP responds that the plugs are new or new-ish. So they swap coil packs around and/or buy new ones - and that never works either. I think it's injectors. Why doesn't anyone ever try new or rebuilt and balanced injectors?
#9
Every single time this comes up people say plugs and coil packs. Inevitably the OP responds that the plugs are new or new-ish. So they swap coil packs around and/or buy new ones - and that never works either. I think it's injectors. Why doesn't anyone ever try new or rebuilt and balanced injectors?
#10
The oil light flickering at idle and the hard start after warm-up is the 1st problem I'd chase. Check your oil pressure with a mechanical gauge and crankshaft end-play (thrust washers?) Before doing anything else.