Missing and Bucking under load?

[berettaboi]

numerous people have told you the likely issue, and Mr. Pink has offered to send you a working part... why are you still talking about it?


edit: just read baack further and you said you changed the ICM with coil packs. was it a known good unit? and the plugs were pulled before that swap?

those black oily spark plugs, the corresponding cylinders are not firing well.

[felixGTU]

When I tested my injectors i tested each one individually. Just put your multimeter in ohms and the injectors should be between 12.0 to 12.5. If they measure out to be 11.8 or 11.9 they are still good too but I would recommend 12.0-12.5. Anything below 10 ohms is not good and anything over 14oms is not good either. I did this on my GTU that would start but when it got warm it would sputter. It turned out to be 3 faulty injectors. I just replaced my injectors from the junkyard But I took my mutimeter to the yard to test the injectors before I bought them.

[3X00-Modified]

He did say he changed the ICM, I don't remember reading that but if he did swap it out then it may not be the issue. The older 2.8's and 3.1's are known for failing injectors and when they do they create very rough running conditions if not possibly a complete no start condition.

OBDI has very little info to provide to you via the CEL, the most you'll get is cylinder miss fire, or multiple miss fires, it's not going to give a code saying injector 4 is failing.

As Felix said, you can pull the upper intake and put an ohm meter on each one of the injectors, OR you can pull the main plug for them and figure out which two wires run the front bank and which two run the rear bank and then do a check on all three which will just be the sum of each one, so if they are measuring ~12 as they should you would end up with around 36ohms give or take some... for each bank, then you can determine which one it may be.

[GTU89]

He did say he changed the ICM, I don't remember reading that but if he did swap it out then it may not be the issue. The older 2.8's and 3.1's are known for failing injectors and when they do they create very rough running conditions if not possibly a complete no start condition.

OBDI has very little info to provide to you via the CEL, the most you'll get is cylinder miss fire, or multiple miss fires, it's not going to give a code saying injector 4 is failing.

As Felix said, you can pull the upper intake and put an ohm meter on each one of the injectors, OR you can pull the main plug for them and figure out which two wires run the front bank and which two run the rear bank and then do a check on all three which will just be the sum of each one, so if they are measuring ~12 as they should you would end up with around 36ohms give or take some... for each bank, then you can determine which one it may be.

Yep, I said I changed them on page two. I may try another ICM to be sure, not sure if I'll do that yet, it did all check out at autozone, and from what I've noticed it isn't heat causing any of this since it does it when its completely cold as well.. (just mentioning that again because there were a few posts saying that even though I had the stuff tested, it could still be the ICM failing with heat, which it might fail with heat, I haven't ran it much since its running bad. But it isn't causing the current problems.

I'll defiantly check the injectors though. I'll just have to figure out how to set the ohm meter up since I don't have any instructions for it anymore.

@berettaboi The plugs were fouled before then I'm sure, because it hasn't really been ran much at all other than for maybe a minute or two at a time to see if changing the aforementioned parts fixed anything.

So, just for future reference the ICM, Coils and fuel pressure regulator are off the table now, just so I don't get anymore posts telling me to change them lol.

This thread is a bit messy though, and I apologize I should have probably just made a new thread instead of bumping my old one, just didn't want to clog the forum up.

[Money pit Beretta]

You should keep this one open until the problem is fixed. Did you get the plugs yet?
When I had problems with other brands there was always a bad missfire.
Spend the extra money for the Platinum AC's. They may be the last plugs you ever have to put into this engine. I have heard that they last for around 70-80k vs the 5k for normal plugs.

[felixGTU]

It depends on what type of multimeter you have if it is auto-ranging junt set it to the resistence which is the omega symbol. if it is not auto-ranging then set the resistance to measure up to 20k.

[GTU89]

The only real question I have about testing the injectors is, do I stick the plug things (not sure what they are called) in between the injector plugs and the injector, or what?

Didn't get plugs because I cleaned them (couldn't do it real well, due to how dirty they were and I was using a tooth brush) and it only ran a bit better. Money wise this week it would probably be new plugs, or crank sensor, because of money being a bit tight . I just don't know which one to get. Seems to have no trouble starting anymore after replacing the ICM/Coils (I got the old ICM and coils tested today, the ICM was bad)

[Money pit Beretta]

My money is on the plugs then. But that is just a bet and I'm not the best at that.
Take the injectors pig tail off and you will see two metal prongs, put the leads on those.
I see you changed your avatar.

[felixGTU]

Take the injectors pig tail off and you will see two metal prongs, put the leads on those.

This exactly.

[GTU89]

Think I fixed it. The one coil Autozone tested as good was actually bad, I put the old coil on and it seems to be okay now. I'll drive it around then to make sure though. Seems like it has a tinny, tinny, missfire around a minute or two of driving, so maybe the plugs do need replacing? Hopefully that is partially due to the carb/throttle body cleaner that might still be in the fuel system from cleaning the injectors and whatnot.

Yup, changed my avatar, I was just going through some pictures I had and thought this would look neat as a avatar pic-thing.

[Money pit Beretta]

I like the new avatar and well....the old one too.
Ok man sound like you found the problem. Now it's time for the steam clean. Why? Because there has to be a butt ton of carbon in the cylinders(if the plugs looked that bad). You could get hot spots from all that carbon, that equals ping.

[Money pit Beretta]

You know what pisses me off? The fact that I have a set of coils from my 90 just sitting around and they work for sure. I have a back up set for my 95 too. They all should be the same too.

[berettaboi]

yeah i would just replace the spark plugs with fresh new ones for the $20-30. how are the plug wires too? i pulled one of my wires off the plug leaving the metal connector on the spark plug a few weeks back... time for a new set, but i have some spares, so it's good unitl i need to touch them again...

you dont need to go with the platinum plugs, but it is recommended, and may get a bit better mileage they say too. NGK makes the Delco plugs now, so just pick up those if you can't find delcos cheaper. and get some lucas fuel system cleaner or seafoam actually (goes on sale for $10 locally)... and run some of that through your fuel system.

[GTU89]

Actually, I can get a set of delco's for $14. I hope that since NGK makes them they aren't garbage, I went through five NGK O2 sensors, then I finally just said eff it and got a Bosch OE one and it's been fine since.

My plug wires are only a few months old, but the one did do what you said yours did (left its guts on the plug) so I'm using a way too long original plug wire until I can find a proper length one (the one that lost it's guts is the shortest front one, and the old one I used to replace it is one of the long ones that go to the rear plugs)

Will seafoam work better than steam cleaning? IDK why but the thought of helping the engine ingest water to me just doesn't seem right.. Not saying it does not work, I'm sure it does. But I'm too much of a wuss to do it lmao. What is the proper procedure for seafoam? I used it before (when I first got the car) but I don't remember what I did (I know I did not use a vaccum line to suck it up like I think your supposed to)

If I go the seafoam route, I should do it before replacing the plugs, right? Think it would be worth while to clean the TB?

I'll probably try to get the car all sorted out tomorrow (fill it up with gas, run a cleaner through it and replace the plugs)

It's amazing how much havok one or two malfunctioning parts can do.

[berettaboi]

you can use seafoam 3 different ways (it says right on the directions on the bottle), some in your oil, cleaning gunk out there (change your oil within 100 km after that or so), some in your gas tank (i like about 1/3 bottle in there with about 1/4 tank of gas.. concentrate!) and then the remainder gets pulled through a vacuum line into the intake plenum.