Cylinder Scoring

shimshim · 2008-10-24 05:43:48

Okay...

I was lazy and wanted to keep my aftermarket warranty good on my car so I took to Mossy Nissan to have some service work done. My cars engine was running fine I was just going on a long trip so I wanted it checked over. They change my oil, flushed my brake fluid, Radiator Coolant, power steering as well as replaced a couple of hoses and engine mounts. 2 days after I got my car back it started cutting off on me and hesitating. I took it back to them and they found that my cam sensor was cracked and fuel pump was putting out 35psi instead of 50psi. My warranty replaced the pump but not the sensor because it didn't set off my service light. I got my car back 2 days go by again and it does the same thing. Mossy wouldn't work on my car this time because my car had suspension issues. Now to the point.... about 3 weeks later my car starts blowing white smoke. I find out that my headgasket blew and now I have scoring in cylinder 2 and 3. I put a new headgasket and thermostat on for a temp fix but its burning oil bad.

I'm curious if I should resurface the cylinders, put oversized pistons and maybe new rods in or just buy a new engine. I do want to rebuild the top and bottom end of the engine because I plan to turbo it in the future. So I don't know whether to rebuild the bad engine or buy a new engine, make minor mods then turbo it.

sorry about the length im jus a little frustrated lol...

SPECial Sauce · 2008-10-24 06:07:30

Wait you are still under warranty?! If so you should call Nissan America and have a nice looooooong chat with them. If they discovered a problem and chose not to fix it (cam sensor) then regardless of not throwing a cel light, they knew about it. CEL lights are for the consumer, not the mechanic. I wouldn't do an f'in thing - except maybe chuck a butterfly into the intake manifold and wait for a new WARRANTED engine replacement, IF they don't cooperate. Is your warranty a Nissan aftermarket warranty?

cute02spec · 2008-10-24 15:19:55

If you build it, just sleeve it... probably easily than resurfacing the cylinder walls since sleeves are effectively new cylinder walls.

But go to Nissan and yell at them first...

shimshim · 2008-10-24 19:04:45

My car has 76,000 miles on it now so its no longer under nissans warranty. My aftermarket warranty wont replace my engine because they want want a 60,000 coolant service which I did myself but dont have enough proof to show it. I called nissan directly and they wont help me out at all, not with a new engine or money to put it in.... so I don't know if I should keep bugging them. As for sleeving the cyclinders, explain that a little better. Does that mean I need to get smaller pistons and rings or can I keep the stock ones.

darsondriss · 2008-10-24 19:07:31

shimshim wrote:
My car has 76,000 miles on it now so its no longer under nissans warranty. My aftermarket warranty wont replace my engine because they want want a 60,000 coolant service which I did myself but dont have enough proof to show it. I called nissan directly and they wont help me out at all, not with a new engine or money to put it in.... so I don't know if I should keep bugging them. As for sleeving the cyclinders, explain that a little better. Does that mean I need to get smaller pistons and rings or can I keep the stock ones.

oh course. old coolant is among the leading causes for scored cylinder walls...

axion4888 · 2008-10-24 20:00:39

yea my engine just did some similar stuff. my headgasket is blown cyl#1 and 2 (consuming coolant an causing misfire on start up). cylinder 3 is scored due to some hack mechanic who helicoiled the spark plug threads and let all the metal shavings go into the cylinder(causing heavy oil consumption). this was helicoiled before i bought the car and i didnt see it blowing any smoke during test drives so i didnt know it was bad). so basically i bought a lemon. i recently heard from a local nissan tech that all qr motors with precat failure are warantied till 100,00. so they will put a brand new engine in at no cost.

so i need a set of pistons what i want to know is if i can get a factory set of pistons that are a bigger bore? .010-.040 maybe? also what kind of improvements would running 07 parts be? headgasket,rods,pistons?
thanx
doug

shimshim · 2008-10-24 20:24:10

does anyone know waht is means when your service engine light blinks?.... it blinked about 3-4times

cute02spec · 2008-10-24 20:26:47

Usually it's not a good sign when it starts blinking...

axion4888 · 2008-10-24 20:50:36

it means your engine is probably misfiring and critical engine/ catalytic converter damage is occuring.

shimshim · 2008-10-25 00:04:35

It looks like my cam and or my crank sensors might be leaking so that might be causing the misfire.

axion4888 · 2008-10-25 17:20:05

do you know if 07 pistons will fit 02-06. i have an 02 qr and kind find factory pistons with a bigger bore. i found 07 with .020 overbore.

axion4888 · 2008-10-26 11:42:21

thanx for the advice
it would only make sense that the pistons would be the same. seeing how everything else is a direct bolt on.

shimshim · 2008-10-28 21:30:45

can anyone answer this......

So my engine is misfiring pretty bad. After replacing the headgasket and thermostat, changing to thick synthetic oil, adding pressure restoring addatives, new spark plugs..... my car still misfires and is blowing white/blueish smoke. The code that popped up is p0300(multiple/random misfire). My only guess of why its mis firing is the scoring in cylinder 2 and 3. Next step is to order a new cam and crank sensor and see if my ECM is trippin. Unfortunatley this is my only car and i need it to get to work so i cant rip the engine apart now. I have to use the car to go to work and to save up enough money to by another engine. I jus am not sure about driving it with these misfire because i dont want to cause anymore damage to the engine.

Any suggestion on how to fix the misfires would be great

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