Fuel injector expected lifespan?

"TeGGeR®" wrote in news:Xns97B9C0D25F15Etegger@207.14.113.17:

Well, it's not. My '91 Integra is experiencing the same vibration under load from about 3,500 rpm to about 5,000 rpm in any gear.

Lift off the gas a bit, and the vibration goes away.

Car has 267,000 miles.

An update: I just changed the injectors for ones from a wreck. The new ones have about

95K miles on them, and looked clean as a whistle to me. I did reuse the filter baskets from the old injectors, figuring that after two Motorvac services they were probably as clean as can be. Certainly they *looked* clean, and all looked the same, with no gum or discoloration.

After installing the new injectors, the vibration is identical to before.

A summary of what's been done to date:

1) TPS checked for voltage: 0.3V-4.4V throughout range. 2) Water temp switch replaced (with OEM) 3) Thermostat replaced (with OEM) 4) Coolant replaced (with Honda OEM) 5) Fuel pressure checked: 40psi. Range is 37-44psi. 6) Two Motorvac services done. One made problem worse, other had no effect. 7) Fuel filter changed (with OEM) 8) Air filter changed (with OEM) 9) Throttle body cleaned 10) Compression OK 11) Driveshafts replaced with aftermarket (original outer left was noisy) 12) Front motor mount temporarily disconnected by tech to test for vibration change. No change. 13) Tires are new.

Any other suggestions?

Harmonic balancer

Lawrence Glickman wrote in news: snipped-for-privacy@4ax.com:

Car doesn't have one. It just has a crankshaft pulley.

My ever reliable mechanic is stumped and it's looking like he's lost interest in this one, so I'm on my own now. But now he's saying maybe it

*is* one of the engine mounts. He's already ruled out the front mount, which is usually what goes bad on this car. The rear mount is majorly awful to get at.

I'm wondering:

1) Exhaust resonance 2) Transmission problem.

Running out of options here. I *could* just live with it and wait for something to break.

Injectors can stick open if debris building on the nozzle or pintle end gets caught under the pintle seat. When that happens- fuel flows continuously instead of in short bursts. That puts excess gas in the cylinder where it occurs, which drops mileage and loads the exaust with unburned gas. It makes the engine run rough, as fuel levels are out of balance. It also washes oil off the cylinder walls, and can wind up causing severe engine damage. The computer readout would most likely point to this kind of problem. I don't think the wear rate of injectors is a big issue, but they do get contaminated right around the nozzle area, sometimes quite crusty. This makes fuel flow irregular between cylinders and that alone makes rough engine operation.

Injectors can be replaced new, or cleaned. Cleaning is much cheaper, but be warned- if it's not done right, you will have more trouble than you can imagine.

I am in the middle of a nightmare with Accurate Injector Service. Injectors they serviced two months ago were stuck open on first start after installation, flooding gas to cylinders. Took the car to the dealer this time. Access requires removing the intake manifold (again) and the full rail set was bench tested by the dealer. Two injectors were stuck open, and we had them replaced with new ones. In the dealers test drive after re-assembly, a third injector stuck- and we had to do it again. We opted to throw out all the serviced injectors and install all new. $1500.00 labor and materials.

Bill Sikes at accurate injector was called before we replaced anything, and told us there was nothing wrong; the sticking was normal and to hit them with a screwdriver handle. Of course that didn't work. Sent him a certified letter with copies of the bills, asking for a refund of the amount he charged as a minimum. Heard nothing for a month despite multiple follow up emails. Once my credit card company notified him that the charge was disputed, he called to tell me I was stupid and ignorant. He has made every excuse you can imagine, and still indicates that he doesn't believe the problem even happened. Currently it's in the hands of Arizona Consumer fraud for investigation, and we are out $1500 for what should have been a $200 job.

I have since found posts by others who have had the same problem with the same company. Unfortunately, I didn't find out before hand, and obviously didn't do my homework well enough. By the way, if anyone else has had similar problems with Accurate Injector Service, please contact me!