Misfire P0310 P0301 P0300 on Stock ish 2001 GTS

[Martyb]

It was, probably 5 years ago!

[MH60M]

Replaced injector & Checked continuity on the Injector wires in question. Everything checks out good.
I had a recommendation to replace the plug wires with OEM and change spark plugs to OEM Gen2......No change.
Did a compression check and all cyl are between 160psi-175psi.

Check-engine codes still pop up on the scanner P0310. P0301, & P0300 after about 3min of cruising at normal operating temps around 60mph 5th/6th gear.

Is there an emissions check that happens at around 2000rpm or 60mph at full operating temp? It seems like the misfire is caused by something there? I get all 3 codes within seconds of each other and they stay until I reset it with the scanner. Sounds great at cold start, but after a short run and CELs it seems to miss at idle from the #10 cyl.

Thoughts?

[Ttillots]

Any update on this? Was it the PCM?

[Ttillots]

@MH60M you and I are running into something very similar. Except I'm getting P0352 & P0354, this has been the death of me......

[MH60M]

Any update on this? Was it the PCM?

It was not the PCM! Zero Change after PCM replacement.

Looks like a coil or wiring issue for you........maybe run a direct ground from the coil pack bolts to the main ground terminal by the green doohickey?

[MH60M]

I'm pulling the intake to look for an obstruction in the runner??? I pulled the Belanger headers to test out peoples o2 sensor positioning theories...no change, but I do see that the #10 runner is black and full of carbon compared to all others.

Laser thermometer indicates CYL#10 exhaust runner is 1/2 temp from the others while running at idle.
Replaced injector with NEW.
Fuel pressure is perfect.
Stock 02' headers
Exhaust is catless / Corsa and free flowing
Compression is good
Spark is sparking via a visual spark tester.
I pulled out the K&N filters to further reduce intake restrictions.

Rag, tape, rat, mouse, bird stuck in the #10 runner is all I have??

Thoughts?

[Crimson135]

Have you used a noid light to check and make sure the injector is being fired? I can't remember if you did and I don't feel like reading all of it again.

[ellowviper]

I love a good mystery...

[MH60M]

F13448F5-40BA-46C6-9701-03C975174898.jpg

So.....I pulled the L/H Valve Cover to look for any kind of damage at cyl #10.( Before I pulled the intake for a rats nest.) I’ve seen evidence of failed lifters and broken springs while researching this issue.

Once the valve cover was removed, I could clearly see black smoke marks on the intake at the #10 runner......then I saw no gasket! I pulled the intake and #1 runner had a cracked gasket. #2 runner had a blown out gasket and red RTV smeared all over the outside of the runner...WTF!


Ordered a set of Cometic intake gaskets and I'm cleaning up the Intake & valley.......hopefully this is it! (Should've did a smoke check first)

Kudos to those that suggested a Vac-Leak!

[MH60M]

I did....Borrowed AutoZone Injector Noid Set...…...and checked all the wires with a meter for continuity.

[MH60M]

Attachment 39674

Another pic.

[Mbccenter]

F13448F5-40BA-46C6-9701-03C975174898.jpg

So.....I pulled the L/H Valve Cover to look for any kind of damage at cyl #10.( Before I pulled the intake for a rats nest.) I’ve seen evidence of failed lifters and broken springs while researching this issue.

Once the valve cover was removed, I could clearly see black smoke marks on the intake at the #10 runner......then I saw no gasket! I pulled the intake and #1 runner had a cracked gasket. #2 runner had a blown out gasket and red RTV smeared all over the outside of the runner...WTF!


Ordered a set of Cometic intake gaskets and I'm cleaning up the Intake & valley.......hopefully this is it! (Should've did a smoke check first)

Kudos to those that suggested a Vac-Leak!

Wow glad you found the problem... Now we can maybe see you out in that Viper

[MH60M]

Wow glad you found the problem... Now we can maybe see you out in that Viper

Someday......I changed the thermostat and PCV grommet/line while the manifold was off......and broke the new gasket re-installing it. FML

Waiting on unbreakable gaskets from VSP. Hopefully this fixes it, I’ve had about 10 “fixed it” moments in the last 3yrs that changed nothing. Fingers crossed.

[Fatboy 18]

Just read the whole thread, Wow, all that work and frustration to find something as simple as a blown Gasket!
Feel you pain

There were certainly some interesting things thrown up!
My car is a 2000 model and I have the Fidanza Lightweight Flywheel. I fitted it myself, Have to say, no codes here relating to that one.
Only codes I get are relating to O2 Sensor, But I have Belanger cat back system and Zero cats. so I just delete the code every few drives.

[Fatboy 18]

Out of interest, how tight were your intake manifold bolts? When I changed my thermostat, I found I had some bolts missing and others were slightly loose!
The OEM gaskets tore when the manifold was removed (but no tears prior).

[MH60M]

Out of interest, how tight were your intake manifold bolts? When I changed my thermostat, I found I had some bolts missing and others were slightly loose!
The OEM gaskets tore when the manifold was removed (but no tears prior).

My intake hardware was pretty loose on the right bank and very tight on the left.

I wasted a few days trying to order VSP gaskets online and by email but that didn't pan out; super disappointed with the experiance. Ordered a new set of standard Cometic ones off Amazon and got them lined up without issue.

NOW.......all the left bank hardware went in fine. The right head has about half of the intake manifold threads ripped out and the bolts spin in the holes freely by hand.

I'm sure this contributed to my gasket issues, intake leaks, and misfire check engine lights. Previous owner must've had the intake off for something and dicked it up on re-install.

I ordered a full set of Time-Serts to replace all the intake mounting threads.

[71firebird400]

Argh! That sucks, but I'm glad you are fixing it the right way with the time-serts.

[MH60M]

Installed a full set of threaded Time-Sert inserts into the heads before new gaskets and re-installation of the intake. It's all back together and torqued as required by the book. It's Alive! Runs, but I haven't driven it yet. (Still tinkering with the brakes.) Idles lower, and new Roe 180* thermostat is operating as expected. No codes yet....but it was just idling.

[Fatboy 18]

Fingers Crossed XXX

Out of interest how do you fit the timeserts? I have no experience of using them?

[MH60M]

Fingers Crossed XXX

Out of interest how do you fit the timeserts? I have no experience of using them?

You can google it. It was my first time too. I should've taken pics......but they're basically solid steel (not coiled wire) threaded inserts that have a slightly expandable bottom like a rivet. The threads on the outside are "timed" the same as the inside, thus reducing the material removed and re-threaded in the base material (heads in my case). They come in a kit with a drill, reamer/cutter, custom tap, and a threaded expansion mandrel. You drill and tap the material like normal, then use the reamer to carve a seat for the insert, finally you install the insert with the mandrel. It gets tight at the bottom and expands the insert to accept the correct threads and swells the lower portion of the insert at the same time like a rivet to hold it in place. I did use some locktite RED on the inserts just to be safe.

I think the GTS-R engines were fully sleeved with steel inserts....not sure if they're similar to Time-Serts.

https://www.amazon.com/TIME-SERT-SAE...s%2C188&sr=8-1

https://www.amazon.com/TIME-SERT-4-2...s%2C188&sr=8-3

[Fatboy 18]

Not a job for the faint hearted!

[Viper Specialty]

I wasted a few days trying to order VSP gaskets online and by email but that didn't pan out; super disappointed with the experiance. Ordered a new set of standard Cometic ones off Amazon and got them lined up without issue.

Look Matt, I am not looking to get into a pissing match with you.

Plainly put, my business is conducted the same way it has been for a couple years now. Orders are via email, website is disabled due to assholes who kept trying to scam it, and me getting tired of canceling orders by those who choose not to read or order $3 in parts and waste my time. Gasket orders have a $100 minimum, and adding gaskets and seals from a different vendor don't count towards the total as it was with your additions by chance, which I explained. I have my reasons for business to be conducted this way, as you well know at this point.

Telling me how "frustrating it is" to follow the same rules that everyone else has followed did nothing but inflame the situation, especially given what I was dealing with at the time. If its that frustrating, just buy elsewhere, as you did. I am not going to go out of my way or change the rules for $6 bucks in profit when dealing with life-altering problems and family issues on a near daily basis right now. I did not cause your problems, nor your bind in trying to process ASAP. Had you gotten our gaskets up front, none of this would have been a concern, nor would it have failed in the first place- but as usual, I am the one dealing with problems after the fact rather than before they became one.

No harm, no hard feelings. Glad you got your problem solved in any case.



Cliff Notes: Since I am not a fan of leaving things open to interpretation, its fairly simple for anyone reading this; Deal with million dollar problems while trying to realize a dream for years on end due to a bad contractor, do the GC's job for free as he steals your money, have a business that is in constant limbo while all of the vultures that forced you into dealing with said piece of shit GC collect their money and force you to continue to waste yours, have your mom pass away while dealing with said bullshit across the country, and then have someone tell you they are "frustrated" with you in an email when trying to get an order to meet minimums to process.

Yeah... lets see how you respond. Was I "out of line?" Maybe a little, since I made my problems, his problems in effect. I was not at all nasty to Matt, but he did get a rundown of what real problems actually look like. I absolutely still would have processed his order had he chosen to move forward, but he went elsewhere as was his prerogative, and that's fine.

Customers simply need to understand that this isn't Amazon, and to stop trying to treat it like so. I don't have the time or desire to process tiny orders all day long while my life falls apart around me because I am wasting time, or worse yet process orders that cost me money to ship simply because the drop ship fees exceed the profit margin since they are so small. I simply cannot, and will not change the rules to accommodate everyone else at my own expense.

At the end of the day, NO brick and mortar store can thrive when customers expect Amazon shipping speeds and ease of order for small things... but, remember that's all you get from amazon. Don't forget to call amazon with your technical questions... lets see how much they can help then.

[ellowviper]

Vipers come and Vipers go and Vipers peter-out you know; but we'll be friends through thick and thin; peter-out or peter in.......

[MH60M]

Vipers come and Vipers go and Vipers peter-out you know; but we'll be friends through thick and thin; peter-out or peter in.......

Well put!

[Fatboy 18]

Well put!

How's the car? any codes yet?