Question about 1990 Lexus ES 250

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I need to know what happen when i put 3 new fuel injectors on my car and i leave the other 3 used?

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Chances are you may have a rough idle. It may also turn on the check engine light.

Posted on Apr 23, 2013

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Posted on Jan 02, 2017

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SOURCE: check engine light need help

Hi kelly4578, Your Air/Fuel Ratio sensor is failing. It is also called the Bank One sensor. The sensor itself is about $200 from a parts distributor and somewhat more than that at a Lexus parts department. Labor to remove the old sensor and replace it with the new one will also run you several hundred dollars.

If you're mechanically inclined, you can tackle this repair yourself. But you must first determine the exact location of the failed sensor. And be careful not to strip the threads in the manifold when you remove the old sensor.

Let me know if this helps and please rate this solution. lone99star

Posted on Jan 12, 2009

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Hi, I need help with my 2002 chevy express 1500. after tune up (change sparkplugs, wire sparkplugs, fuel filter, air filter, distributor cap and rotor) , I feel my van sometimes cough when driving, when...


I wouldn't give up on it, but I would sure be P.O.ed at the mechanic- $700 for a bad diagnosis. Why would he think 3 injectors were leaking? Was it running rich? Did he do a scan for trouble codes? Did he check fuel pressure?
Probably something minor-anything now should be minor after $700. Well, at least you got new fuel injectors. Have some tests done, scan for codes, check fuel pressure. Carefully clean the MAF sensor with maf cleaner spray, or at least a sensor safe spray cleaner. It is delicate, so use care. Let it dry thoroughly before putting back on. About all I can think of, good luck.

Oct 01, 2013 | 2002 Chevrolet Express

1 Answer

Fuel injector


No it should be ok but yopu may have a rough idle or other problems.

Apr 21, 2013 | 1990 Lexus ES 250

1 Answer

After putting gas in my car, why did it start shaking really bad and idling real high?


After a fill up, the fumes in the gas tank are very concentrated. If problem with evap system, it could cause problems after a fill-up. Just a thought.

Mar 10, 2017 | Cars & Trucks

1 Answer

Misfire on cyl 3 & 5 and noticeable bucking on


Hello, How about draining the tank and putting fresh gas in? Change your fuel filter after you drain the gas from the fuel line. Do a fuel sample in a glass container and see if the gas separates. By now you may need to clean the fuel pressure regulator and the new Injectors may be clogged by the dirt in the system.

There is also a potential problem if someone used the fuel line bracket or fuel line as a ground when jump starting the vehicle. This is under the NHTSA bulletins. The fuel line bracket under the hood is a convenient place to hook a jumper cable. If someone did this, then the fuel line can be cooked by the jumpstart. The rubber hose underneath the Stainless steel lines can overheat if a jumper cable is attached.

To me, touching any part of a fuel line with an arcing power source is extremely dangerous. I would like to know if this happened to you and what the final repair was found to be on your vehicle.

Sep 20, 2011 | 1997 Ford Explorer AWD

1 Answer

The rubber o-rings fell out of the fuel line, and I need to know what order they are supposed to be in so I can put them back correctly.


emove the six reverse torx bolts from the fuel rail using an E7 star socket. You may notice that the paper fuel rail gasket is starting to or maybe already has broken between the intake ports. This will cause a lean code condition. (P0171 and P0174)
2. Gently pry the fuel rail off of the lower intake and the six injectors. Note the orientation of the injectors beforehand.
3. Remove all six injectors and discard all 12 o-rings.
4. Thoroughly clean all gasket surfaces and o-ring surfaces.
5. Clean the o-ring areas on all the injectors.
6. Put new o-rings on the injectors. A light film of motor oil on the o-rings will help in seating the injectors.
7. Put the injectors into the lower intake.
8. Put new paper gasket between the fuel rail and lower intake and make sure all of the injectors are seated into the fuel rail.
9. Put the six reverse torx bolts back in and torque them down in this sequence:
<Firewall 1 3 5
............ 6 4 2
To 12-16 N*m (9-11 lb*ft)

reassembly is the reverse of the dissassembly. after you get this done, get you a cold one. heck get two. you deserve it.

(you can let the children and small animals back in the area now)

Dec 06, 2010 | 1993 Ford Explorer Limited

1 Answer

I need to know the firing order of the coil packs. I have replaced spark plugs and wires and coil pack but there is still a miss. Put a new crank shaft censor in it as well


Do you have a code for a misfire?

If a crank sensor goes bad the vehicle will typically not start at all.

If you have spark to all the cylinders than the next step is to either check compression or check the injectors. Usually the injectors will stick when this happens they will ohm out fine but will not spray fuel. To check them you will need either a high end scan tool or and injector tester and an fuel pressure gauge. The tester is connected to the injectors one at a time using the bulk connector near the alternator. The injector is then triggered by the tester as you watch for a drop in fuel pressure. Whichever injector does not drop fuel pressure when triggered is the bad injector.

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Nov 22, 2010 | 2002 Buick Rendezvous

1 Answer

What is the wire that plugs into the back of the coil pack? The computer said Cylinder 3 misfire. Have checked the spark plug, spark plug boot, and the coil pack.


You leave all coil pack connectors on their respective cylinders.
Usually the crank position sensor tells, the computer where the pistons are,by where the flywheel is,as it passes the sensor.
You leave all injector connectors in their number sequence.
Every vehicle uses different ways of pulsing the injectors. Not familiar with yours

Most likely NO,to the coils and injectors being tied together.
You can not spray fuel and try to ignite it, at the same time,it has to get into the cylinder and be compressed, one cycle before the spark.

You could switch injectors,and a relative did that, earlier this year, based on your theory. Sound thinking,a lot of work and not your problem.

Might add, that while your plugs may needed to be replaced,they had no effect either. Personally, never had a plug failure in 45 years,could happen I guess.

So you buy one new coil,start on one side of engine,and walk that coil from one cylinder to the next,every time you get a 300 misfire code. Put the OE back and move the new one. Consider you may have others on their way to going bad.

Make sure you have no vacuum leaks anywhere.

Aug 04, 2010 | 2002 Nissan Sentra

3 Answers

99 vw passat sw 1.8t #3 cyl not firing. Compression good & even,replaced plugs #3 wet, fuel fouled. Replaced coil pack,still misses,all connections look good. Any suggestions?


ihad the same problem.. its not the coils or anything like that.. and any reg mechanic wont know the prob unless they under vw.. u need to replace ur power output stage.. thats what cylinder 3 misfire is.. after i fixed it my car is good as new. i

Jun 26, 2009 | 1999 Volkswagen Passat

1 Answer

Cylinder 3 will not fire. running lean...


If you look at your engine as a group of one cylinder engines, it will help. What is not happening in that cylinder? is the injector allowing fuel to enter? Is spark happening? Is the cylinder itself in good condition ? ( are valves opening/closing, is compression good) One of these items is missing there...you need to find out what and why.

Jun 08, 2009 | 1999 Ford Ranger SuperCab

1 Answer

'95 Honda Civic EX will not start after cleaning fuel injectors


I would talk to who cleaned the injectors, I don't know if it something they did or not. It could be a stuck open injector. The exhaust would have a raw fuel odor if it was. What it sounds like is a blown headgasket, which can just happen. The exhaust would have a sweet smell to it. Usually starts as a small leak (between cyl. 2 & 3), the engine burns the coolant while driving which you don't see. Then the coolant level gradually drops to a point where the car overheats, which warps the head, causing a large leak. Now you see the coolant burning (white smoke).
Good luck Honda Al

May 12, 2009 | 1995 Honda Civic

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