Bad injectors

[T45]

After checking my injectors 2 have bad readings. One reads nothing at all and the other reads 35 ohms. I assume either the second one is on it's way out or it's bad already. I had the car running pretty good before it's de-construction albeit with a nasty miss. Does anyone have 2 good injectors laying around? Any companies that can rebuild the bad ones?

[Q45tech]

Nobody rebuilds injectors they just cleanup junkyard takeouts either chemically or/and ultrasonically.

Open or high resistance caused by exposure to alcohols or ethers in gasoline causing plastic body to swell and connections to be stressed....stretched.

Once one goes a good chance others will follow if you continue exposing them to fuels they were not designed to tolerate.

Does VB add ethanol to fuel? The prior to 2002 and especially prior to 1997 were not designed to tolerate it. Not everyone fails immediately alot depends on water% in ethanol. and if sulfuric acid was used in dehydrating the ethanol [most have stopped this practice now].

[T45]

I'm not sure about ethanol in fuels around here. I'll have to check that out. I bought the car from P.A. and according to carfax, it spent a lot of it's life up in the P.A., N.J. areas.

[Q45tech]

Whenever you see cheap used 370cc injectors for 300zxtt/Q45 single or complete rails buy them and select your 8 from 32..............that should last a few years with ethanol.

Be sure to change all the fuel rubber hosing to fluro interior liner hose.

[T45]

Thanks! I just filled up today and noticed a sticker on the pump that said the fuel contains up to 10% ethanol.

[Q45tech]

Well with ethanol you must decide where to move or put up with injector failures.

[T45]

Looks like U-hauls now come standard with VH45's...

[silkysmoothyjud]

what about iso dri or iso heet? Does that effectively neutralize ethanol? It gave me fifty extra miles in a tank of gas in my neon. My neon freakin hates it!!!! My Q has injector problems. Screw using used injectors, I bought mine brand new from Joe......

[maxnix]

ISO-HEET keeps condensation enabled by ethanol in suspension so the burn is more even and the corrsion damage is mitigated.
Modified by maxnix at 8:51 AM 5/24/2007

[elwesso]

You can get injectors from deatsch works, click the ADVERTISER DIRECTORY link in my sig, and it'll take you there!

[mtcookson]

I believe Deatsch Werks now has some sort of adapter to use the later injectors on early injector engines. They're supposed to work a little better than the early injectors.

[elwesso]

im pretty sure all you have to do is get the later model plastic grommets that the injectors sit in.

[mtcookson]

I believe the wiring is different (actual trigger from ecu) and the plugs themselves are different (square versus a sort of oval if I remember correctly).

[elwesso]

The ECU works the same way. Im pretty sure you can just get hte new harness.

Im running an early model ECU on my late model motor.

[mtcookson]

Hmm... that's weird. I'll have to look at what they said again.

[elwesso]

its just the harness and the bottom of the 90-93 injectors are skinnier.

[T45]

Update, I bought some used injectors off of PopPop with excellent service. I recommend him to anyone for providing quality service, parts, and super fast shipping! Thanks.

[450Z]

Along the same lines I have been successfully running the engine in the car over the past few weeks with a smooth idle and great throttle response. Last Friday I took it to the track to do a shake down run of my 450Z and found that after a few acceleration runs the engine started to miss at idle and never ran clean again. I went through 5 gal of gas in about 15 miles of full and part throttle runs around the track. I feel that I may have some injectors that are stuck open. I realize the engine has sat for a couple of years, but when I rebuilt my VG30DETT a few years ago I had a problem where the inj were stuck closed from sitting too long not open. Has anybody else had this kind of problem with a VH45DE that has sat around for a while?

[silkysmoothyjud]

My Q does the same thing. If you car starts out smooth and then subsequently idles rough its because an injector or possibly two injectors (depending on how rough the idle is) are stuck open and are drenching the cylinder(s) with gas (my guess). In my case, I tried to use two used injectors that were cleaned by Deatchwerks. I put said injectors in and the car ran great for about five miles. Then the vibrations started. I could visually see the vibrations in the engine and said rig-job blew the seal on my water pump (I replaced the water pump). I tried to order two new injectors locally and only came up with one new one after waiting for two weeks. Frustrated from waiting, I had another used injector lying around and tried it with the new one. The result, a slight vibration after the car ran for about five miles. The vibration was not that bad, not as bad as having two leaking injectors, you could only feel it at idle, but it started to throw a check engine light. So, after the fifth time of doing the same two injectors, I bought mine brand new from Joe and I would not ever considering doing it any other way. I hope you know which one is doing it, since mine did ohm to spec and I NEVER would have found them unless I did the job myself. It would have been a terrible trial and error process trying to find which one was doing it. Unless there is another way you can tell an injector is bad. Is there another way? Deatchworks didn't tell me they were bad after a flow-test. Just venting, but it sounds like you got some bad gas and should bg44k and iso heet it.

[ScottJackson]

On ebay there's sets of 6 370cc injectors being sold for like $380. They're new Venom brand injectors for the 300zx. If the guy would sell a set of 8, it comes out to a price of $500. That sure would be a lot cheaper than buying new from the $tealer. For a little more $$$ you can get bigger cc injectors that should be plug-n-play. Quite tempting if doing the bigger MAF housing along with bigger injectors and boost on stock ECU works on the Q. I'd know by now if I didn't have my '69 Mach1 project taking all my time/money/effort.

[mtcookson]

I've heard quite a few times that the Venom injectors aren't very good so I'd be careful.

[ScottJackson]

Yup, I've been doing some reading and it sounds like Venom injectors are bad news. I don't think I'll be trying them. Maybe I should add another project to my list... making fuel rails and lower injector fittings to adapt bosch style injectors to the Q.

[silkysmoothyjud]

Just changed my used injector with a new one. Runs fine now...Lesson learned. Every time I try and cheap out on this car with some rigged up second hand BS I end up wasting time and money. Buy new OEM injectors dude!! I just did injector number three and injector number four five times trying to cheap out. I wish I just would have done it right the first time. I have a brand new spare OEM injector. However, I wont let it go cheap. 140.00 delivered. I might keep it around, but Joe might get it back.....

[T45]

Cracker broke, cracker gotta cheap out on injectors this time. Next time I have a cool $1000.00 laying around I'll think about buying new injectors, but will probably just spend it on things necessary to sustain life.... like beer and strippers.

[silkysmoothyjud]

That is hilarious! Money spent spent on hookers and beer is better than money spent on a car (might as well spend $ on essentials!!): I always say. I would have spent a lot on my Q's restoration if it wasn't for this site: I would be in the poor house for real. I'm getting my hood and bumper painted next month and I'll start posting pics of Niqole, the Q that NICO helped build...