Fuel Injector

[jimbyjimb]

Have a miss, cyl.4 injector ohms O.L. All others are 13-12.5. Looks like a plenum removal. The KS also did not ohm so while I'm in may as well do those and whatever hoses I didn't do last year so I don't have to do it again in '10. Ick. I'l be busy this weekend. I am going to check my plugs first, just to be safe. Replaced those not even a year ago with factory NGK plugs. I found in a past thread injectors with a lifetime warranty, anyone tried these alternatives? I'd rather pull the plenum every year and get free injectors than pay 170 for OEM.

[jimbyjimb]

Directauto.com is the lifetime warranted injector.

http://www.directautomotivepro....html

[Infinitiguy19]

Make sure that the OHM meter works as it should, because I bought a crappy VOM from Auto zone (Don't flame me ) and I bought a 10 OHM resistor and it OHMed at 10.4-10.6 OHMs between the two resistors.

But life time warranty is only good if the labor is easy too.

[Q45tech]

Read the fine print on warranty. All items must be returned BEFORE new ones are sent assumming they agree the part has failed and has not suffered abuse [from improper fuel not listed] and dozens of other jump thru hoop disclaimers.

I appears you can be injectorless for 30 days..................I would buy a spare if you can find another one as a core.

[maxnix]

Directauto.com is the lifetime warranted injector.

http://www.directautomotivepro....html

Those are all for 1990-1993, so single pintle design, not later rotary disc design.

So one has to wonder how they will perfom long term.

[jimbyjimb]

The waiting doesn't matter, I can send in a refundable deposit and get it back when the defective unit is returned. The thing that gets me is if it would be called "normal wear and tear." Either way, for 50 bucks how can I lose? At the worst I'll just have to pull the plenum off. No big deal. I will be sending the bum injector in for a rebuild so I have a spare.

[jimbyjimb]

Doesn't seem to matter since all of them live on borrowed time with ethanol and a possible rise to 20% content. There is no long term anymore.

[MinisterofDOOM]

No ethanol here in Utah (at least not from stations worth buying from). One county tried it and dumped it. The rest of the state has never bothered with it.

[maxnix]

No ethanol here in Utah (at least not from stations worth buying from). One county tried it and dumped it. The rest of the state has never bothered with it.

It's federally mandated for future use. Texas governor tried to exempt parts of TX that didn't need it (anywhere outside of Houston and DFW) and was rejected.

[jimbyjimb]

I see some activists trying to keep ethanol from premium fuel, maybe something will happen. Unlikely. I know Aviators are pushing hard as are Marine guys. Another question-what is the reference I see on the injectors for "dots." Green, none, or yellow. Mine have no visible marking.

[maxnix]

No one really knows, but dots may have been used for early flow matching.

[jimbyjimb]

Thx for the quickie. No dot it is.

[Q45tech]

When you examine the typical ecu transmitted open time at hot idle you see [1.1 millisecs] at 34 psi is an almost unmeasurable amount of gasoline per squirt.

8 grams of air per second [11 revolutions] or 8 grams/ 44 gulps =~ 182 milligrams of air/ 14.7= 12.3 milligrams of gasoline

Luckily the engine doesn't much care what the AF ratio is at idle as the NET RPM is what it tries to maintain. Low rpm more gas and air until it stabilizes.

Obviously rpm differences [12, 25, 50] as seen in power balance are mostly from injector variances UNLESS the cylinders vary in compression.

[jimbyjimb]

Keep in mind that you're talking to a guy with Fonzie as his avatar...

Just kidding man. Thanks for the input. Unfortunately I don't care about my 2k car enough to pay someone for a PB test, though I wish I were back in tune-up class with the whacky old Sun scope. It actually worked really well. So did the dyno. And the lifts. Man, my garage SUCKS!

[maxnix]

With the right cord, the right software and a laptop, you can come pretty close to a Consult.

[Denver90Q]

Not sure if they use ethanol in your area, but your best bet is switching to aftermarket brand (BWD) or '94-96 injectors. Different color dots have different flow rates as do old worn injectors and aftermarket ones.

[jimbyjimb]

I've looked up info on the BWD's and know about the 94-96 conversion but as all of my injectors but the one ohm fine I'm only doing the one. As far as I've researched nobody has found a real solution to this problem. I've read some of Heath's posts and haven't seen any updates lately. Should a permanent solution present itself I'll do it only when I need to. No use throwing out good injectors. I'm planning to increase my filter replacement interval and increase fuel additive use to try and combat the problem, but since I haven't been convinced the swaps work my attitude is why throw money away. I appreciate the input though. Also, I was being an idiot and ohmed my KS inappropriately, and I got 500 ohms, so no KS replacement needed either, thank GOD. I'll probably replace some fuel line while I'm under this time as there is less time pressure.

[GseaQ]

Hey, I have a good factory injector from our old '92 I'll never use. If you want to pay for shipping and a case of beer I'll Priority Mail it to you. I bought a brand new one to fix a dead cylinder and discovered it was the coil, not the injector. Never saw ethanol. I can send it from Sumas, WA tomorrow if you want it.

Glenn

[silkysmoothyjud]

Did you ohm the KS while it was hot? They will show no ohm on my 94 if its cold.

[jimbyjimb]

Nope, did it wrong the first time. Thanks for the offer but I've already ordered a replacement. Thats is a swell offer though. I'd suggest hanging on to it as a backup what with injectors dropping faster than Gerald Ford on a flight of stairs.

[maxnix]

Did you ohm the KS while it was hot? They will show no ohm on my 94 if its cold.

That's most definitely not true on the OEM I tested.

[jimbyjimb]

Agreed. Sounds dubious.

[jimbyjimb]

Ok, have the whole top end in pieces ready to be assembled when my parts arrive. Cleaned runners, intake, TBI, IAC, EGR, re-ohmed injectors and decided to r/r KS since the bodies are cracked even though they still ohm good. Also getting new IAC hoses, heater hoses, KS harness and injector harness, swapping to 0-40 M1, changing fuel filter,replacing all fuel lines and most hose clamps. Whew. Halfway done in 4 hours time. Wonder what flat rate is on all of these jobs. I was an idiot and flooded cyl. 4 with fuel by mistake so now I have to r/r plug and drain the cylinder. And change the oil. Other than that mishap it's all gravy. Also confirmed cyl. 4 injector is dead. There is alot of carbon buildup in there as it is all still sealed factory at almost 190k. I think I got a good one. Old Jehovah witness took good care of this beast. After this I should be sitting pretty until another injector fails, then it will be a real quick r/r job.

[silkysmoothyjud]

Non OEM perhaps, POS multimeter? Mine were cracked like a SOB throwing CEL before it was all changed. Dont flood that valley.....Dont forget to change the runner gaskets..

[jimbyjimb]

No offense, but anybody who can pull apart the top end of a Q, walk to the parts store and have all components cleaned waiting for reassembly in under 4 hours is probably smart enough to know to replace gaskets and not flood the valley. I was a professional mechanic and have been working on vehicles since I was single-digits. This is common sense stuff here. Q-specific details are one thing but I have the general common sense issues covered. Thanks for checking anyway though. I know it was well intentioned.

[maxnix]

Common sense is a lost trait in many of our younger members.

[silkysmoothyjud]

I know, that is why I mentioned it. He should of just said he was replacing the top end and left it at that instead of making a redundant list that left several key things out.
Modified by silkysmoothyjud at 2:38 PM 4/4/2009

[jimbyjimb]

Again, appreciate the intended help, no need to be a douchebag.

[silkysmoothyjud]

Look, I have way too much respect for this site to respond negatively to such facile comments. Also, flooding the valley is one of two causes of KS failure. This guy is "rebuilding" his injectors, not changing his KS with the harnesses and is calling me names.....I will leave it at that and will not come back to this repost thread....

Modified by silkysmoothyjud at 12:09 AM 4/5/2009
Modified by silkysmoothyjud at 12:11 AM 4/5/2009

[maxnix]

I think JimyB knows what he is doing and the consequences of a return visit to the valley of KS death.