Venom 720cc injector problems
 

First off, a little background. The car is an 6/87 Turbo II with low impedence injectors. I recently installed an Rtek 1.7(ECU was sent in for install) along with 720cc/min secondaries from Venom(low impedence), purchased off Ebay. A set of four was purchased.

About a month after installing everything(the car ran great for a month and perfect before the install of above components), the car would intermitantly surge and backfire like it was running super rich until one day the car just turned off on the freeway while driving. The car would not restart and had all of the symptoms of flooding, however no amount of effort would get the car to restart. Once the car was home and it had cooled off it fired right up again, but would again shut off somewhere around 160*F coolant temp. It finally got so bad that sometimes it wouldn't even start when cold. The problem was totally intermittant. It was impossible to drive the car at all as the symptoms would pop up like clockwork.

My first thought was check the CTS, but it checked out fine. We swapped out a known good AFM, coils as well as checked fuel pressure which was right on the money. All injectors have power and grounds are all good. Alot of diagnosis was put into the problem.

After thinking about it for a bit, we decided to swap in the other 2 720cc Venom injectors. After doing that, amazingly the car fired right up and ran like a champ. All symptoms were gone. Best we could figure is that tat least one secondary injector would hang open due to some internal flaw and flood that rotor.

This would be shortlived however, two days later the symptroms returned. Only thing I can figure is that the set of injectors was bad/faulty/poor quality and is causing the problem.

My questions -
- Has anyone here experienced a problem similar to this - injectors hanging open and flooding engine?

- Has anyone had a bad experience or can comment of the quality of Venom injectors(which I think are remans)?

-If I purchase new Greddy injectors does it seem likely to anyone that there is some other issue that is causing the injectors to be damaged or will this fix the problem?

-Is there some other problem here that I am not seeing?

Sorry for the long post but this problem is becoming a thorn in my side and needs to be remedied without spending tons of money replacing all kinds of parts. Thanks for any help you can proivide.

-Bryon

yeah
they are shit injectors...


i mean, how can they offer 4 injectors for the same price as 2 nippo injectors?

damn its a good thing i read this, i was about two minutes from ordering venom 720 secondaries o__o

ok, it ran fine after the inital install right?

up until the shut down on the highway, right?

you put in a new pair of injectors and the problem went away? for a short while, right?

was the time frame between the problem cropping up both times similar?

what Im getting at is it sounds like your Rtek ECU might be burning up injectors...

the old ones must have been PERMANently opened "fubar'd" and leaking gas into the motor any time there was any fuel pressure in order to flood it to the point where it won't run....

And I thought that too, but in theory only the prom is changed and should have no bearing on the injector drivers. And whatever the problem is, its only affecting the secondaries.

The first time it happened it took about a month for the problem to manifest itself. The second time it was within the span of 2 days.

fuel pump..maybe

We had a pressure gauge in the system the whole time. Not once did the fuel pressure ever falter as the car would die. It was right around 43-45 psi with a walbro pump. I dont think its the pump.

perhaps the in line resistors are fried?

Dam i just get the venom 720cc yesterday for my 87 tII i hope there not a problem with their injectors. I did not install them yet. Any more input would be great before i install them.

My Venom 780cc High Imp.(yup high imp) injectors say Denso on em. They are rebranded Nippon Denso injectors... :lach:

Mine don't have anything on them. Hopefully will get some good feed back from people that use venom injectors.

I'm thinking the problem is in your system and not with the injectors. Are you missing your injector reisistor pack? ~rich

my Venom injectors say Denso on them as well....rebranded.....

I will be buying venoms in the spring... as I have heard good things

typical...Turbo mfr's do this all the time...

Yup, I think I read somewhere on this forum that Greddy injectors are also rebranded Densos.

In reference to the resistor packs, they are still in the car however I havent checked to see if they are in some way bad. I will check them tonight. If this was the case as was causing the ecu to see a higher resistance than the injector driver wanted to see it could damage it. However, how come after the install of new injectors did it work ok? Could the injector drivers somehow become intermittant in their operating.

probably just that it took a certain amount of time to burn the injectors....

Maybe you have a loose injector connection or small break in the wire harness. The heat from the engine would make the break or looseness appear.

I also have an S4 w/ Rtek1.7 and GREDDY injectors, I have had no problems.

Theoretically, without the resistor pack the injectors will drop all the voltage so the ECU should be fine depending on how it's constructed. Of course this being a peak and hold ecu, it's design is for passing current, so again you should be ok.

Now that I think of it, there are many different types of injectors with an EV1 style connector but have DIFFERENT IMPEDANCES! Are you sure you got the correct injector not just one that fit your plugs?

Venoms are just regular injectors that have been modified then slapped with their sticker. First time I ever saw them was years ago making HP injectors for mustwangs... ~rich

wrong...
shitty reman.

try comparing the price of a NEW denso injector... that works...

Now that i look closer mine have a ND stamped on them. how can i check if their High or Low.Thay match up to the ones i took out of the car. BTW it's a 87 tII. Thanks

Measure the resistence with a multimeter.if they are under 5 ohms they are peak-hold types.If you bought them as drop in they should be right though as the stock injector plugs are different if they are high imp. vrs low imp. injectors(i.e. offset vrs. centered alignment tab on the plug).
On a side note,I was going to purchase a set of venons a while back locally and the vender told me they have to doublecheck the flow of the injectors themselves as they had a number of injectors that didn't flow the output they were supposed to.I bought 680cc GSL-SE instead and had them cleaned and flow tested.

Any other input on the vemon injectors

Well, I have an update and it isnt positive. I swapped out injectors for some new Greddy ones and the car ran great for a day and then the problem crops up again. It was not the injectors directly causing the problem. I am convinced that it is a problem with the Rtek itself and am hoping that I can send it back to them have them inspect it to determine if there are any internal problems. I just wish I had a stock ecu to install to see if the problem went away. This problem has left me stranded on three different occasions and it sucks!