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Just installed new injectors an now car idols rough

Reply #30 – February 15, 2013, 12:01:36 PM

Get the codes pulled. Anything that serious should show up in codes.You should perform both key on engine off (KOEO) and key on engine running (KOER) checks. There is a high likelihood that the problem will show up between a few codes.

The bigger injectors wouldn't do anything to the rest of the fuel system. Also, at idle if one injector was bad you would barely notice it. These things can run pretty smooth with 7 cylinders working, and they can still run but quite poor on 6 cylinders. The likelihood of having multiple injectors failing is very low. I'd stop looking at the injectors and check the fuel pressure AFTER pulling codes. I'm not sure parts stores will pull codes on an ODB1 vehicle so I'd find a code reader to use, or purchase one for $40.

Also, have you touched the distributor at all? Verify that the base timing is set to 10 degrees and that the spout connector is plugged in. Again, these would show up with the engine diagnostic tests. The computer knows what it expects to see, and it will tell you about anything that doesn't match its expectations. You may have even had codes that you didn't know about from before you stopped driving the car - there are a few common ones that won't impact drive-ability much until the parts begin to fail completely.

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Just installed new injectors an now car idols rough

Reply #31 – February 15, 2013, 02:03:12 PM

I also recommend pulling codes but it isn't going to tell you if you have a leaking FP regulator(at least not directly), or loss of vac to the MAP...

If it seems to be running poorly as in several cylinders misfiring, I'd be checking plugs and maybe wires to be sure they aren't crossed... If that's the case, a gun type thermometer will quickly tell you which cylinders are misfiring... Just aim at each exhaust runner on the manifolds... If there are some dead cylinders(temp will be far less) then you have issues with ign system or the injectors/wiring, maybe EEC...

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Just installed new injectors an now car idols rough

Reply #32 – February 15, 2013, 05:07:29 PM

Well I work all weekend so it will be Monday before I get to fool with the ole bird but ill keep y'all informed

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Just installed new injectors an now car idols rough

Reply #33 – February 17, 2013, 11:35:14 PM

All you need to pull codes is the car, a paper clip, and a $1 test light. It takes 5 minutes, and will give you a very good idea of things to check.

I would also recommend resetting the base idle after pulling codes if no ide related codes pop up.

First check for any vacuum leaks, then start the car. While its running, unplug the iac and turn down the throttle screw until its barely running. Plug iac back in, reset computer, or pull battery for 10 minutes. Done deal.

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Just installed new injectors an now car idols rough

Reply #34 – February 18, 2013, 12:18:22 AM

Do you have the plug wires set to an SO firing order, or are they set to an HO pattern?

If you have it firing 1-3-7-2-6-5-4-8, with the number 1 cylinder nearest your passenger headlight. then that will cause your idle problems.

The correct f/o for your engine will be 1-5-4-2-6-3-7-8.
Only the HO cam will change the firing order, and thusly those affected cylinder's plug wires must be rerouted.

Just throwing that out there.

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Just installed new injectors an now car idols rough

Reply #35 – February 18, 2013, 01:50:13 PM

Plug wires are set to SO firing order I'm going to have the codes pulled 2moro hopefully an I'm going to check for vac leaks

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Just installed new injectors an now car idols rough

Reply #36 – February 21, 2013, 01:45:32 AM

Ok check timing is dead on I almost think I have a stuck valve
Now on cold start it idles for about 3min an dies an its rough but once it warms up it idles like its got a mild cam u can hear an feel it an when driving once up to speed (once I get there) if I pull my foot off the gas u can hear something clanking like a tink. Tink tink but I put foot back on pedal an it goes away an it seems to be getting worst the more I drive it an I'm at the point were I'm just ready to do a complet rebuild any ideas

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Just installed new injectors an now car idols rough

Reply #37 – February 21, 2013, 04:35:34 AM

Yes, run codes.

Instead of guessing what the car wants, why not ask it?

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Just installed new injectors an now car idols rough

Reply #38 – February 22, 2013, 09:21:24 PM

Ok pulled codes one is
EGR sensor voltage is out of range
Running lean on bank one( don't know which side of Motor that is)
An a O2 sensor SS1
So that what I've come up with so far not really dug into it anymore
I think I'm going to take the cats off of it an replace the O2 sensor

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Just installed new injectors an now car idols rough

Reply #39 – February 23, 2013, 12:57:36 AM

I don't remember if you've said this, and I can't find it above. How does it idle when the engine is cold? If the problem is only when warm, o2 sensors would be likely but only for some time before the EEC marks that o2 sensor as bad and continues on in open loop (this would explain your fuel economy).

Have you ever touched the harnesses behind the intake? You don't happen to have the oxygen sensors plugged into the correct sides of the wire harness, do you? this would cause one bank to go lean and the other to go rich. The EEC is too dumb to correct them internally.

EGR also not working correctly could be flooding the motor with exhaust gases if it's stuck open, or if it is leaking and allowing outside air in. I'm not sure you can test this easily without a hand vacuum pump.

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Just installed new injectors an now car idols rough

Reply #40 – February 23, 2013, 02:55:44 AM

If your o2 sensor is shot, you can see if it runs any different by unplugging the o2's. This will automatically disable the adaptive fuel strategy on the computer and send factory tables in place of the o2's. If it runs better after, unlug the o2's one at a time and see which sensor is bad.

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Just installed new injectors an now car idols rough

Reply #41 – February 23, 2013, 10:21:51 AM

Tha car at cold idles horrible am will die if let to idle say to warm up before driving but after motor reaches temp car idles better but runs like its got a couple dead cylenders an which side is bank one?

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Just installed new injectors an now car idols rough

Reply #42 – February 23, 2013, 11:50:35 AM

o2 sensors are not functioning at cold start, not your problem...

Learn how to run the codes and do a cylinder balance test...

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Just installed new injectors an now car idols rough

Reply #43 – February 23, 2013, 02:58:37 PM

Didn't realize o2's weren't used for cold start. Ignore me.

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Just installed new injectors an now car idols rough

Reply #44 – February 27, 2013, 03:31:09 AM

So I need to see about replacing the egr sensor an go from there

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