1997 850R rough idle after head rebuild

Post by **erikv11** » 29 Jan 2014, 17:06

renzo86 wrote:... Well, spark plugs and cables are new. Rotor cap is new. ...

What is the make on these parts? A preset spark plug gap is not necessarily a correct gap, I always check them anyway.

Since #5 is the problem, there are tons of threads here about misfires in just one cylinder you could check them out. But usually it comes down to ignition or injector, you are on the right track.

One quick way to test the injector wiring here would be to swap the injector connectors between 4 and 5. The injectors are pulsed, so they all open at the same time, this will tell you whether or not the #5 injector is getting the pulse to open.

That whistling sound is bizarre though, I wonder if that is related.

socompsp · Post by **socompsp** » 29 Jan 2014, 17:16

yea that whistling sound i think is air escaping during compression which would cause a miss.

renzo86 · Post by **renzo86** » 29 Jan 2014, 22:23

Tonight I swapped injectors #4 and #5. I got different codes. P1310. P0300. Mutiple misfires. I guess there's something going on with the fuel system. First thing I'm gonna try is a new fuel filter. And then I'm gonna try at least a whole can of seafoam in the tank.

I might wait for my tax return since I've been spending money like crazy lol

What do you guys think?

socompsp · Post by **socompsp** » 31 Jan 2014, 21:01

i think you can get a set of reman'ed injectors off ebay for $150. idk how much they should be trusted as far as flow matching,but id like to know myself as well seeing as im looking into them myself lol. but if your fuel filter has the original factory undercoat on it id replace it regardless. you can also take an old tire pressure guage to the fuel rail to check the pressure.

Post by **erikv11** » 31 Jan 2014, 21:31

I don't see any reason to suspect the fuel system, although ensuring the fuel filter is in decent shape is a good idea. For example, I don't see how the whistling sound would be related to the fuel system. In addition, at this point I'm assuming some of the ignition parts are suspect. It's too bad there is no way to know the make on the wires-cap-rotor-plugs.

I would first eliminate the whistling sound, for sure that is wrong. Then move on to troubleshooting other things, one at a time.

You might also want to do a compression test, I consider that essential follow-up any time the head was pulled.

socompsp · Post by **socompsp** » 31 Jan 2014, 21:40

i agree, the sound of air escaping could be your whole issue.

Post by **Zimbo** » 01 Feb 2014, 12:50

I know jblackburn mentioned it and you said you're sure of it but when I was watching your video the sound of the whistle prompted my wife to say 'hey that sounds like the problem you had with your car.'
After replacing my oil trap I had rough idle and, according to my wife, that same whistle. The bracket was my problem.

renzo86 · Post by **renzo86** » 01 Feb 2014, 20:17

Zimbo: which bracket are you talking about? I'm gonna check my PCV just in case. I'm gonna have to buy lifters anyway.

I've talked to a couple of my teachers in my auto mechanic classes and they agreed I should replaced the cam followers/lifters. That's gonna be the first step since compression seems okay. These are the numbers from #1-#5: 165,160,165,170,170 psi

The whistling sound could be caused by the valves not opening and closing enough to make good combustion.

I honestly don't remember the brand of the plugs but I want to remind everybody that the car runs. Just rough idle. Misfiring codes could be related to spark, air, or fuel. So I'm trying to solve this puzzle.
Last thing I want to think about is electrical wire being fried somewhere but could be a possibility.

Post by **Zimbo** » 02 Feb 2014, 09:25

The bracket that goes on the bottom right manifold bolt that guides the oil trap line. Very easy to have that end up between the manifold and the block. Well it was very easy for me to have that problem! I'd just double check that.

-Rob

renzo86 · Post by **renzo86** » 03 Feb 2014, 20:22

Rob: you are the man!!! Lol. I went to pressure wash my PCV and intake manifold at the car wash. A lot of crap came out of there. Also, I did what you did and put the damn bracket in the wrong place! So now the car is running GREaT!!!!

Problem one was: that stupid bracket I put in between the intake manifold and block. It was supposed to go on the outside.

Problem two: my PCV was clogged! I can't afford a new PCV kit so what I did was to take the oil trap box and the intake manifold to the car wash and I pressure washed the crap out of them. I was told to use compressed air but I like to keep my parts as clean as possible! So they came out clean and shiny! No need to spend more money on a PCV kit. Just clean the thing at the car wash but take your time and make sure you dry things up after.

So I put everything back in the car and I prayed and crossed all my fingers and toes. Now my 850R sounds, feels and runs just great!! I'm proud of myself and I'm thankful for all of your comments and suggestions!!

Thanks everybody! I really hope this helps other people!!! God bless!!

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1997 850R rough idle after head rebuild

Re: 1997 850R rough idle after head rebuild