Injector replacement

jznd, I can't speak for the fitment or performance of the injectors, but I know the seller/owner of Fiveomotorsport and he's a standup guy, so you can buy from him with confidence.

 

I am finding it difficult to believe there isn't anyone in Hong Kong that can clean your injectors. This isn't rocket science, a few of my local garages even have the cleaning machine in house.

 

So I purchased one of these in a goose chase from another thread trying to chase a CEL. It worked fine for a day or two, but CEL came back. Long story short, my car is apparently now working without a misfire in cylinder 10 but the mechanic repairing told me the cause was the injector and I believe he replaced with OEM. So while the injector you are referencing above connects and seemed to work initially, at least for me, it did not solve the problem. I am basing this entirely off of what my mechanic told me, going to pick up car from him today

 

Any of the good injector cleaning companies can tell you whether or not an injector needs to be replaced. Has to be one in Hong Kong with the number of injected cars there.

 

I can believe a single new injector might upset the OBD2 apple cart if it's not "exactly" the same as the other 11, and/or hasn't been flow matched to the others. So I would replace all 12 as jznd is proposing, or I would bite the bullet and pay the eye watering price for a single, genuine OEM one.

 

Well that's what ended up happening, I paid for a new OEM one. The thing I'm not convinced about with my situation is that I sent all 12 injectors to Mr. Injector and the sheet they were returned with said all were functioning perfectly so I put the OEM one back in place of the aftermarket one and still got misfire.... I'm not convinced my CEL is gone for good

 

Not every missfire is due to the injectors. OEM wiring is very suspect. The Oem injector is proprietary and there is not bosch cross. DHelms claims the 550 injector to be pretty special. While there are swaps that fit and you can guess at specs you need I would stick to the OEM injector if possible on a stock 550. Wiring is so bad SRI has n aftermarket wiring harness for the injection which is amazingly robust. I beta tested it for SRI and it is extremely good! On my own car I have rebuilt my harness with new pins boots and milspec wire. Only the Italians would make an injector harness the way they do. Take it apart and you will just shake your head. If you can move the injector around and get that hole to give you a misfire code then it is the injector.

I have used Mr. Injector. He is good. But he is not as good as RCengineering in Torrance. The history goes RC got too big for his britches and jacked the prices. We went to MrI to get cheaper service which was better than a can of injector cleaner in the gas tank. MrI never had the depth of knowledge it seemed that RC had. RC's business disappeared. A few years later when his sanity returned RC would talk to you like a human again and deliver a few hour turnaround on injector service at an industry average price. RC has the depth to rebuild and modify injectors as needed. We are back to using RC engineering.

 

Not to sidetrack jznd's thread, but I would put an inductive timing light on the ignition lead for the cylinder with the misfire and see if you get a nice even flash. A lot of our misfires these days are ignition related because the HT leads are old and have non-visible cracks that are causing them to arc to earth. Sometimes you can even see the arcing if you open the engine bay on a dark night and look at the HT leads.

 

Most misfires are ignition related. In the olden days we told folks carburetor was a French word for "leave it alone" in most cases, and fuel injection is about the same.

 

Agreed, and when you think about what a HT cable has to endure, ie nearly a billion pulses of 20,000 volts and 50-75 mjoules of energy over 15 years, while living in the hellhole of the 456M or 550 engine bay, it's amazing that they last that long without breaking down.

IMHO we're going to see LOTS of "weird" misfiring issues in the near future, and I hope someone will come up with a reasonably priced "OEM looking" solution. My COP solution works really well, but it's not close enough to "OEM looking" for some.

 

+1 for the Cribbj COP. It is the best! It looks better than OEM because it cleans up the engine bay. It is made better than OEM too. You can put the old stuff back on for the concourse judge in about an hour.

 

I have had nothing but good experiences with RC engineering and can highly recommend them. Much cheaper than replacing the injectors with new and you get before and after printout of leakage and flow rates to make sure that they all flow the same (or within an acceptable percentage of each other).

 

What kind of CEL do you get? SLOW DOWN? I managed to start my 550 the other day while leaving one plug cable off, so it was running on eleven cylinders. After that I now have a constant SLOW DOWN light even it the car seen to run perfect on all cylinders. What can I do to get it away? What is a COP wiring harness looking like? Any pictures of them?

 

Erik, you'll probably have to do an ECU reset to get rid of that Slow Down light. Most OBD2 readers can do that, or you can try opening the battery switch and let the car sit for a few hours and then close the switch and start 'er up and see if the SD is gone. You'll have to go through the usual ECU learning procedure if you do this, however.

Vis-a-vis the COP harnesses, here are some pics of an early harness set as installed on my 550. The first pic shows the four jumper harnesses on the bottom row for the optional ignition upgrade that I offered at one time, which was an ignition booster made by a famous Japanese tuning company. It boosted the output of the system by roughly 25 mjoules, but it was really only useful if someone planned to track their car or turbo/super charge it. Needless to say, not many of these upgrades were sold.

My harness builder suffered some health issues in 2016 which knocked him out of the business of building harnesses for me, and unfortunately he also misplaced the documentation he used for dimensioning the length of the harnesses, breakouts, etc. So I've not actively pushed the system since then, but I've recently reacquired the original set of harnesses that I sold to a Houston owner, and I'll be getting dimensional info from them and (hopefully) will be able to offer the system again as soon as I can confirm a potential new harness builder is capable of building to my standards.

Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login

 

With the right tools in the hands of someone who's done it before, it shouldn't be more than 30-45 minutes, and that's being generous.

 

I hope your COP mod becomes available again. It was extremely well done and still working flawlessly on my 550. Everyone with a 550 should be running it.

 

Carl, thanks for the kind words! Yes I want to offer it in the future - it's a good alternative to OEM, and more of our cars are going to be having misfire issues, and if left unattended, there'll be serious damage to the cats, and possibly the cars themselves if/when the cats overheat.

 

Agreed! Good combustion is everything. Cats can not only overheat but cause fires. That is no lie or exaggeration. The last time I looked at the cost of a new 550 wireset I said no way on this earth will I pay that for wires. So I made them. Then you came up with the COP...NIRVANA!

If there is anyone who be in the Maranello Hall of Fame it is MSW...you and Dave.

 

Yesterday I took the 550 downtown, such as it is, to run a few errands and as I sat at several stoplights I was thinking how smooth the engine ran compared to the occasional stutter it had before John's COP was installed.

BTW, if anyone needs/wants a complete OEM used wire set make me an offer