Life of lpg injectors

[benji]

Would anyone happen to know the average life of lpg injectors?

These ones are at least 10 years old this December.
I've had to replace one, but am now getting injector codes on 3 of them, and it's running pretty ordinary.
I believe they're a good quality injector (a valtec type 37).

Any info would be greatly appreciated.
Benji.

[bee utey]

Injectors last as long as they last, sometimes 50K sometimes 200K. Depends on what goes through them, quality of LPG and quality of filters have a big influence. I'd be buying some metal body type 30 injectors myself, don't really like the plastic body stuff. Try this mob for size, their prices are pretty good:

https://www.lpgshop.co.uk/

[scarry]

I have two work vans here,both are around ten yrs old,and have done over 300 000k's.
The LPG injectors are original.

The only thing that has been replaced on one of them is the converter.

[DAMINK]

What actually goes wrong with the gas injectors?
Not a great deal of working parts in a gas injector... Atleast not in the ones i have pulled apart which is only the ones i have on my d1.
All in all pretty easy to play with.

[Pedro_The_Swift]

Injectors last as long as they last, sometimes 50K sometimes 200K. Depends on what goes through them, quality of LPG and quality of filters have a big influence. I'd be buying some metal body type 30 injectors myself, don't really like the plastic body stuff. Try this mob for size, their prices are pretty good:

https://www.lpgshop.co.uk/

These ones?

https://cdn7.bigcommerce.com/s-0baae/images/stencil/1280x1280/products/76/3221/VALTEK_Type30_4_Cyliner_LPG_CNG_Propane_Autogas_In jector_set__66162.1449319751.jpg?c=2?imbypass=on

[bee utey]

What actually goes wrong with the gas injectors?
Not a great deal of working parts in a gas injector... Atleast not in the ones i have pulled apart which is only the ones i have on my d1.
All in all pretty easy to play with.

Failures I have observed in injectors:

Coil failure (open circuit), rarely, broken wires occasionally. I replaced one or two Impco BRC injectors at a hideous cost when they were slightly out of warranty. Other than that they're very reliable in general.

Bore and plunger erosion, due to dirt or poor manufacture. Zavoli unit injectors used to be bad for that. Plungers would stick in a wear step and flood intermittently.

Rubber end buffer failure, PRINZ and Zavoli rail injectors. One cylinder would then run as rich as hell, you could at least get service kits for Zavoli. PRINZ was another hideously dear injector to replace.

Valve seat wear causing leaking after shut down.

General gunking up, often fixable by back washing with carby cleaner.

Plastic parts breakage, threads stripping.

That doesn't include manufacturing faults like rails with different strokes on individual injectors, I'd have to carefully file the ends of plungers to even them out. Some Chinese mob advertised some injectors on ebay a few years ago, very poor balance between injectors and I only bought them once for a try out. Worked OK after fiddling but too much work to get them right.

My most recent installs have all used AC Stag W01 injector rails, they're quiet and precise, and run on the same software settings as the Valtek injectors. Affordable too. I hate swapping brands as then I can't carry spares easily, not that I've had to replace any AC Stag ones yet.

[bee utey]

These ones?



Yes, them or the AC Stag ones that look exactly the same.

[DAMINK]

Mine are the same as the pic above but are green in color.

144438 Pic of me trying to dial the buggers in. Later worked out dialing old injectors dont work. Better of doing it by hear and feel.

I inquired about getting a kit for it and they said the unit i have had been superseded with a red set, i assume similar to above pic.

That was several years ago now.

[bikeman]

I needed a new gas ecu for my Emer system. I used Tinleytech, in UK. They were great, responded quickly and well priced.

[Pedro_The_Swift]

I needed a new gas ecu for my Emer system. I used Tinleytech, in UK. They were great, responded quickly and well priced.

More Info Please bikeman!
engine size, part number, cost, ease of replacement,



and PICS!!!

really, what were you thinking??[wink11][tonguewink][bigrolf]

[bikeman]

Hi Pedro,
The ecu was for a 4.6 but will also suit a 3.9. The cost was about $380ish landed. I don’t have the part number, I sent them a photo of the original. It came with leads and a link for the latest software, install is basically plug and play with a little tuning, this was done at Graeme Coopers. I don’t have any pics of the new unit but this is the original.https://uploads.tapatalk-cdn.com/20181002/aeb72c46328f40ee46768253a6e63406.jpg

[Pedro_The_Swift]

What was the original ECU doing wrong?

[bikeman]

Not switching to gas. We tried to re boot the ecu and re install software but no go.

[Zcoota]

Daft question, how do you test them ? We've clocked up 250k on the gas injection system that still pulls cleanly, idle is slightly rougher than when first installed but we're also talking about a 400k engine. The system starts on petrol and cuts to gas when warm, it used to be a silk smooth cutover that could be done at full throttle now its misses once on cutover and then runs ok. I'm wondering if its just general wear and nothing to worry about or are the injectors due to be replaced.

[bikeman]

I’m not a mechanic so a lot of that is left to the eggberts. I’m not sure you can test an ecu without specialist equipment. As far as injectors are concerned, maybe Bee Utey can answer this one.

[bee utey]

Daft question, how do you test them ? We've clocked up 250k on the gas injection system that still pulls cleanly, idle is slightly rougher than when first installed but we're also talking about a 400k engine. The system starts on petrol and cuts to gas when warm, it used to be a silk smooth cutover that could be done at full throttle now its misses once on cutover and then runs ok. I'm wondering if its just general wear and nothing to worry about or are the injectors due to be replaced.

Most software packages let you shut down one LPG injector at a time and run that cylinder on petrol. That lets you isolate a crook injector. Sometimes back flushing them with throttle body cleaner helps. Looking at the tuning with a laptop lets you see from the injector times how far out of tune your LPG is. A simple thing to try is to adjust the regulator pressure if you can find the screw, as often wear drops their delivery pressure. Setting up your own laptop with the correct software is the best method though, nothing beats seeing live data as you mess around.

[Zcoota]

Most software packages let you shut down one LPG injector at a time and run that cylinder on petrol. That lets you isolate a crook injector. Sometimes back flushing them with throttle body cleaner helps. Looking at the tuning with a laptop lets you see from the injector times how far out of tune your LPG is. A simple thing to try is to adjust the regulator pressure if you can find the screw, as often wear drops their delivery pressure. Setting up your own laptop with the correct software is the best method though, nothing beats seeing live data as you mess around.

Not a bad idea getting the software, I'll track it down. I didn't realize you can shut sown an injector at a time, that's a handy feature. Thanks for the idea.

[bee utey]

Some cheap spare parts for someone...

Vapour injection LPG kit - Suit Ford AU 4.0l | eBay (https://www.ebay.com.au/itm/Vapour-injection-LPG-kit-Suit-Ford-AU-4-0l/283192078615?epid=28024430199&hash=item41ef903117:g:kE8AAOSwjE1btGkt)