like the title says.... all of my injectors are between 17.2 and 17.5 ohms, and i am wondering if there is a possibility that the injectors could still be bad. the car is an 88' iroc with a L98 and the only mod being a 3" flowmaster catback.

 

I had two bad injectors on my '92 even though they all had proper ohm readings. To check the injectors, get the engine warmed up and then disconnect the IAC. Now, you can unplug the injectors one at a time and see if any are bad. When you disconnect an injector there should be a noticeable change in the idle in other words, it should get rougher, if not the injector is most likely not doing its job. Hope this helps.

 

The ohm measurement only reflects the injector's electrical properties (resistance). It can still fail mechanically.

 

A quick test to see if your injectors are leaking ( a mech. failure) is connect a fuel pressure guage to the fuel rail. Start the car and note your fuel pressure while running. Then shut the car off keeping the guage connected. If pressure bleeds down to zero after shutting the car off you have leaking injectors.

 

the reason i am asking this question is the engine is already running rough, hard to start, shakey idle, and slow rev up of the engine.

i already tried the test method of unplugging the injectors one at a time, and nothing changes, the idle is still rough, doesn't get better and it doesn't get any worse. but i did not unplug the IAC before doing the test, is that really necessary?

i have also did the fuel pressure test, pressure does bleed down to zero in a matter of 10 seconds, this is not do to the injectors, i have discovered that its bleeding out of the vacuum port off the fuel pressure regulator, i already have a new one to fix it, but i dont think that it has to do with the engine running rough because i disconnected the line from the plenum and plugged it, and it still runs rough, no changes at all.

 

Did you pull a couple of the plugs and check what they look like? The plugs will tell you what cylinders you are having problems with. And fix the presurre problem, it will cause more problems then you can imagine.

 

yea i pulled a couple of plugs, they looked really good with a light brown color to them, they did smell like they were soaking in gas though, probably because of the leaking pressure regulator. i will definately fix the pressure regulator, but i dont want to have to put new injectors in unless i have too, and if i have too, i want to do it at the same time i do the pressure regulator.

 

I think I may have a bad injector as well. When the engine is cold it idles well. After a warm up run, It begins to miss. I have new plugs, wires, rotor, and a cap. Can these fuel additives made to pass your cars smog be the problem? Because it worked great before I put it the product in. Also anyone have a general price point for replacement injectors. (22Lb)?

 

i asked a smog tech once about that "guaranteed to pass smog" BS. and he said that hes had tons of customers run that stuff before the test, and from his experience he said he saw no change from using it or not. as for your particular instance i would recommend for you to run that stuff out of your tank as much as possible then fill up and drive 15-20 miles to clear it out of the lines for the new fuel to takes its place and see how it runs before you spend money on new injectors.

btw there is a guy on ebay that sells 19lb rebuild svo injectors for $110 half the cost of new ones. 19lb ford injectors are equivilent to 22-23lb in our cars.

 

Will do, thanks for the info.... I think that I will also need the OEM plugs. I bought AC Delco plugs. They were supposed to be hotter. However I think since I changed them out they have made it worse. I wil be removing them tomorrow to check the color and possibly go back to the original spec plugs.

 

I'm running the Champion RV17YC plugs in mine, and it seems to run better with those compared to the original AC's. I had the Champions in it before, and when they needed replacing, I figured I'd give the original plugs a shot. It didn't seem to run as good, so I took them back out after a couple hundred miles, and put another new set of the Champions back in, and it noticably ran better.

 

any feedback on Autolite 26 plugs

 

not true. all injectors are rated the same way. ford just runs a different pressure.

 

I used to think the same thing, all injectors are rated at the industry standard of 3BAR (43.5 psi). while this is true, bosch manufactured these injectors specifically for Ford, and Ford changed their ratings to match Ford vehicles... the rating that comes from Ford is 19lb/hr @ 36psi. i actually had a set of Ford 19lb's cleaned and tested a while ago, and it came with a flow chart that showed all injectors flowing 22-23 lbs/hr @43.5 psi. i will have to see if i can find the chart, i know its around here somewhere.