Recently my mechanic told me my injectors were bad. Recommended staying with stock ones like Borg Warner which he said are good or Delco. Anyway,, they seem pricey so I was at FiveO and seen some Yellow tops 22lbs that seem tempting,, but then I heard I should go with the 24# injectors. SO what should I do?? My car is basically stock and I'm a little short on cash right now. I was also told if I go with high performance injectors then I may have to upgrade more parts and start spendning a whole lotta money. What do u guys think ??

 

why does he say the inj.s are bad ? whats the engine doing? is it tpi, tbi ? what are the symptoms. did he test them?,jimmy

 

Originally I was told it was the fuel pump by another guy. Then I was told the fuel pump and injectors. He said the inj are reading low volts?? or something like that? Its a pretty good shop very knowledgable crew so they seem! I have a 350 TPI.

Symptons are: Initially car starts right up and runs good for about 1/2 hour then it starts to idle low almost like it wants to stall. If I turn it off and try to restart,, it wont start up unless i wait lets say 15-20 min. And even after it starts up again, it runs like crap... lots of power loss.

 

The stock injectors are more than adequate to supply the fuel required by a stock engine. Larger injectors are needed when you modify (soup-up) the engine which can produce more power and therefore needs more fuel. Also if you change the injectors to larger ones, you have to reprogram the ECM. If you have no plans to change heads, change cam, add headers, replace exhaust system, the stock injectors will be fine. On the other hand, if you know that you plan to do this in the future, and you need to replace the injectors, to save buying a second larger set after the engine is modified, get larger ones and they will work "ok" on a stock motor with reprogramming.
Larger injectors on a stock motor won't make a measurable amount of more horsepower than reprogramming the ECM running stock injectors.
Whatever you do troubleshoot it first and be sure what the problem is before you spend that much money. Your symptoms sure sound like a partially plugged fuel filter or FPR to me. Put a fuel pressure gauge on it and drive around for a while. The best injectors in the world ain't gonna do squat with no fuel pressure. If it won't restart and it has a solid 42 psi on it, then suspect the injectors.

 

Btw, just a tip, the correct 22 lb. Ford injectors have pink tops, not yellow. The yellow ones are 19 lbs., which are correct for the 305. The 24's have a light blue colored top. I'm assuming your "mechanic" checked the ohms resistance when you say he measured them. If any of them are lower than about 14.5 ohms, then they really need to be replaced, and it's usually best to just replace them with a whole set of 8. I would recommend going with the Ford "pink tops" instead of stock replacement ones. They're cheaper to buy, and from what's been said on here from guys using them, they're a lot more reliable than the originals. You do see the yellow and blue ones for sale a lot more often, but the pink ones are available, and are correct for your 5.7. As stated above, there's really no point in running the 24's, and having to get your prom adjusted for them, if you're not planning on doing any big mods to your motor. There was a guy on the classifieds here that had a set of the pink, flow-matched ones for sale a while back, and he said he purchased them from Five 0 Motorsports, so you should be able to get a set from them if you decide to go that route.

 

Thanx 4 the info bro. but i been to the five o site 10 times and they are yellow tops 22lbs according to them. check 4 yourself dude let me know,, i'm close to getting a set soon.

 

Yeah, went to their site, and I see what you mean. They actually are 19 lbs., but according to them, they cross-reference to our cars as being 22 lbs. I think it's because our cars run a higher fuel pressure setting compared to the Mustangs. I went to ebay, and you can save some cash buying the same injectors from five o if you go through ebay. Here's a link to the same ones from them for $249.95. http://cgi.ebay.com/ebaymotors/CORVE...spagenameZWDVW Or, if you really want to save some cash on them, check out this set I came across. http://cgi.ebay.com/ebaymotors/19LB-...spagenameZWDVW As reliable as they're said to be, if it were me, I'd go for the cheaper set. The listing says they've been checked and rebuilt, and they're a fraction of the price that five o wants! They even have the spiffy looking nickle plating on them.

 

HI New member here, I have been seeing different numbers as to the OHMS that a stock fuel injector is supposed to have now for my 1989 350 TPI My Mechanic Showed me out of the GM manual that the OHMS are to be at 10ohms I keep seeing different numbers any Ideas?

 

Supervisor42, in his last paragraph, is the route I would endorse. One thing in common with the eight fuel injectors is the SINGLE fuel pump. I would suspect the single fuel pump could make all eight fuel injectors LOOK bad. And you feel all eight fuel injectors have gone bad at the same time? So I second monitoring the fuel pressure through the time that you start having symptoms of the problem. Supervisor42 I believe has the right approach in finding the REAL problem.

 

He may have been looking at the TBI injectors. They supply 1/2 the fuel for the engine verses 1/8 for the TPI injector.
The ohms reading for the fuel injectors will change as the temerature goes up. The TPI injectors will range between 16-17 ohms. Close to 16 at room temp and close to 17 at operating temp. The injectors are checked at operating temps because most often they show electrical problems when they are hot.
The TPI injectors should not read as low as 10 ohms unless they are specialty aftermarket units.
Check yours and let us know what they read.

 

to my knowledge, stock inj. ohms are supposed to be between 12 and 16 ohms, I just recieved a rebuilt set, and all checked in at 13 ohms. As far as your car, I have had a very similar problem, and it was the fuel pump, which is a common problem. either check your fuel pressure when it happens and or listen carefully at the back of the car for the fuel pump when it starts running bad, does it get louder or make a different whine....i would suspect the pump.

 

Yes My Injectors were tested both cool and warm, and the GM Manual said "PORT INJECTION" - 10ohms.... because I had questioned that with all the other info I was reading, what is weird on my injectors on the "EVEN bank has two injectors that imp, is lower than 10 but but the Odd Bank is where the miss is and the injectors imp. read OK could the "Even Bank be Affecting the Odd bank?

 

Are you reading them with an ohmmeter or thru software?