Massive hesitation, SES light flashing :(

nimrod.sixty9 · Aug 8, 2013

I know SES flashing is usually a missfire. My worry... is it likely caused by the spider injection? That, from my understanding, is known to have issues.

I have a '99, I could only imagine it has the newest style considering they went with the LS the very next year. Would I be right?

Aside from the codes, where would you start? Replace plugs, or go stright for pulling the intake?

Ill get the code/s later tonight.

nimrod.sixty9 · Aug 8, 2013

Code is P303. Missfire cyl 3.

Truck still runs like poo at all speeds, including idle. Flashing seems to only happen when getting into the pedal or going over bridge.

Is this spider injection? Intake gaskets? Plug? Wires?

Where to start?

SunlitComet · Aug 9, 2013

Does not mean usually, IT IS LIVE ACTION MISFIRE.

---------- Post added at 09:51 PM ---------- Previous post was at 09:50 PM ----------

And as I mentioned start by reading your plug.

nimrod.sixty9 · Aug 9, 2013

SunlitComet said:
Does not mean usually, IT IS LIVE ACTION MISFIRE.

---------- Post added at 09:51 PM ---------- Previous post was at 09:50 PM ----------

And as I mentioned start by reading your plug.

What do you mean by live action? I want to be sure cause it is not consistent. The rough running is, but when its flashing, its a whole lot worse.

BRUTUS_T_HOG · Aug 9, 2013

Unload that shotgun.....

You have a continuous misfire at all speeds. START with a compression test to verify engine mechanical condition before wasting time on throwing parts

If you have good compression across all cylinders, a shorted distributor cap or other ignition system trouble is far more common than a failed CPSFI assembly

nimrod.sixty9 · Aug 9, 2013

Of course now I get a better look today; I notice water/coolant on the intake around the thermostat housing and rear of the compressor. Look in rad and I cant see anything. GF said she never saw the temp go up... FML

Mostly dry, weee bit wet.

I should also note the plugs were miss-gapped when I got the truck. I regapped them then. Now that I think of it, I believe the truck had a misfire code when I got it. That's how I discovered the miss-gap. Been fine for two years...

nimrod.sixty9 · Aug 10, 2013

Here are my codes;

SunlitComet · Aug 10, 2013

what is the plug wet with. And check any connectors related to the two speed sensors that are flaking out to see if they are dirty if not replace them. Those are not dirty "sensor head" issues. BUT FIRST AND FOREMOST.......

How the hell did you get C**** codes on the scan xl package. Were you connected logically to the PCM or something else. Even Palmer says it likely would not work.

nimrod.sixty9 · Aug 10, 2013

SunlitComet said:
what is the plug wet with. And check any connectors related to the two speed sensors that are flaking out to see if they are dirty if not replace them. Those are not dirty "sensor head" issues. BUT FIRST AND FOREMOST.......

How the hell did you get C**** codes on the scan xl package. Were you connected logically to the PCM or something else. Even Palmer says it likely would not work.

Cyl Comp
1.....170
3.....150
5.....180
7.....180

Give or take

I coulodnt tell what it was wet with. Just a little near the thread area. Otherwise it looks like cyl 1 and cyl 5 and 7 look simular. Basically, 1 and 3 match and 5 and 7 match. Ill take pics soon.

SunlitComet · Aug 10, 2013

Will wait for pics and what about the codes I asked about. Can eliminate a head gasket issue for sure.

nimrod.sixty9 · Aug 10, 2013

SunlitComet said:
Will wait for pics and what about the codes I asked about. Can eliminate a head gasket issue for sure.

Dont know anything about the codes. Same ones shown when I got the truck (scanned from AZ); replaced the sensors, didn't show up until I used ScanXL.

Also, compression check was dry, with plugs 1,3,5, and 7 removed.

Tacky · Aug 10, 2013

You do not give a lot to work with. Have you used a spark tester on #3 plug wire? It sounds like you are loosing spark under load, may be a bad plug wire and/or distributor cap

SunlitComet · Aug 10, 2013

NGK's? get the crap out of there and use delco 41-993 or autolite xp605's. And do not ever gap or attempt to re-gap non copper core type plugs. Do a resistance check of the spark wire and look inside the cap for burn marks or arcing that would indicate the spark is jumping around. Delphi or Delco or Msd parts for that stuff if needed. From the looks of it 3 looks like it is lacking a spark but is getting fuel and 1 is getting to much fuel. 5 and 7 look normal.

nimrod.sixty9 · Aug 11, 2013

Had some ACdelco laying around I never installed, put them in and now have a world of difference. However, Im still not satisfied... Seemed it may had a small miss at highway. So small infact, I could not tell if it was a mis or the highway itself (Florida roads are horrible). Still, ran a million times better, idles perfectly, etc... Had a bit of a stumble the first time I got on it when shifting to secnd. Almost seemed indecicive. Only happened once.

Think I may put the old cap and rotor back on. What you think?

How about that low psi in cyl 3?

Also did FP test and leak down test. hit 55psi and stayed. Dropped about 3 PSI after about 8 minutes.

SunlitComet · Aug 12, 2013

while it is low and may stand out a bit it is not low enough (compared to the other 3) to consider a ring job. I will tell you this, when i got my suv it had misfires in 2 cylinders because the old injectors were dumping to much fuel. Caused backfiring in the intake as well. That extra fuel was washing out the cylinders and as a result had lower compression then the others. All the issues went away when the spider was replaced as well as new ignition components. If unable to determine make and age of cap and rotor put in new delphi, delco or msd ones in. Fuel pump is old but still hopping along just fine.

nimrod.sixty9 · Aug 13, 2013

SunlitComet said:
while it is low and may stand out a bit it is not low enough (compared to the other 3) to consider a ring job. I will tell you this, when i got my suv it had misfires in 2 cylinders because the old injectors were dumping to much fuel. Caused backfiring in the intake as well. That extra fuel was washing out the cylinders and as a result had lower compression then the others. All the issues went away when the spider was replaced as well as new ignition components. If unable to determine make and age of cap and rotor put in new delphi, delco or msd ones in. Fuel pump is old but still hopping along just fine.

I believe the cap is delco and about 6 months old. I believe Ive done the leak down test properly, but Im still not convinced. Maybe fuel and spark is good, but intake gasket not so much?

Also, I dont know if I mentioned this before, but when I pulled the wire off of the coil, I pretty much had no rsistance. Im not sure if it was all the way down. But if this was the case, would I not have missfires all over the place rather than just cyl three?

SunlitComet · Aug 13, 2013

Yes they would be multiple however take in consideration how the cap is wired and the possibility for some easy shorts and ones that are less likely. Strange things com of that.

---------- Post added at 11:35 AM ---------- Previous post was at 11:34 AM ----------

Concentrate on full diagnostics of everything related to cyl 3 be it leak down, ignition and stuff.

nimrod.sixty9 · Oct 4, 2013

It's back. Except this time its only P300. Suddenly runs like poo, out of nowhere.

Why would it be fine for two months after replacing a plug and suddenly bad again?

Still considering putting on the old cap.

gpracer1 · Oct 4, 2013

"I notice water/coolant on the intake around the thermostat housing and rear of the compressor. Look in rad and I cant see anything. GF said she never saw the temp go up... FML"

That part would bother me.

nimrod.sixty9 · Oct 4, 2013

gpracer1 said:
"I notice water/coolant on the intake around the thermostat housing and rear of the compressor. Look in rad and I cant see anything. GF said she never saw the temp go up... FML"

That part would bother me.

Already fixed, was thermostat gasket. Just looked and antifreeze is there again. **** this truck...

Massive hesitation, SES light flashing :(

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