going to work on the ignition timing tomorrow on my 94 4.9 , needed to know what the timing is supposed to be set at and if i need to pull any wires or vaccum lines before i do it , there is no sticker on the underside of the hood or anywhere that tells me how to check/adjust ign timing

also the bolt that holds the distributor down is hidden , anyone have a idea on where exactly it is ? :banghead2

Too long since I did it. I'll have to look it up on Monday when I go back to work.
I THINK it's supposed to be 10 degrees BTDC and you put it at base timing by grounding the diagnostic connector under the dash. Hopefully someone here can verify that before Monday.

Correctamundo, Katshot..10Degrees BTDC at less than 800 RPM..Detroit manual says"Jumper pins A & B at the DLC connector while NOT in diagnostic display. SET TIMING MODE message will be displayede on the Climate Control Driver Info Center." ..Then set the distributor timing... Can't help on where to find the hold-down bolt as I haven't had to set my timing yet so I haven't looked, but I'm sure taking off the top part of the air cleaner will give you more room to look...Hope I helped some...

THANKX!!!

after i get some house cleaning done ill go out and begin

If it's anything like the 4.1's the hold down bolt is probablly under the distributor pretty much right under the cap facing the fire wall. You'll need a crow's foot to get it. It's a PITA to get to too.

ahh cool , thankx much dude

Hey Scrapeyard, how'd you get that picture of me on my bike???

Hey Scrapeyard, how'd you get that picture of me on my bike???

I haven't seen any pics of you yet in the "post your picture thread".

I'm internal combustion genius, but computer illiterate...how do I post them? I don't have a scanner, if that's what I need..Picture Brittany Spears when she's in her 40's and you'll have a good idea, though... :angel:

Well in that case would you be up for being a model in our Cadillacforums.com calendar, hot girls, hot cars, cool attitude.

You want a 46 year old for pictures???... Only if I can wear the gloves I wore in my last pro fight :shocked2:

interesting thing happed today ...no more ping , it rained this afternoon , so i pulled it int he garage to beging retiming the thing , then i relaized i had to play soccer mom and ferry the little bro to band...

so anyway on the way there i killed the radio and climate controll to see if it was pinging , no ping

so i probed the pcm data side of the computer , it says im sitting at 25 to 30 degrees avance btdc , this normal at idle while talking to the computer?

it also says im sitting at a water temp of 89 celcius or 192 degrees farenheight , im going to take it out tomorrow before it rains while its hot out and get another water temp reading

i read a caddy website that said to check my raditaor cap and cooling system so after i take my reading tomorrow ill go grab a cap

oh and another thing my p039 code can be caused by a old prom , is this a part i can pick up or something that needs reprogramed?
i got that info here:
http://www.caddyinfo.com/howtop039.htm

but his is a north * so im kinda wondering if it applys to my 4.9 or not , my tranny is a 4t60e tho......

as always i enjoy all the help i get here , and im loving trobleshooting this thing , that computer makes things so easy

Hey Scrapeyard, how'd you get that picture of me on my bike???

It's that whole minds eye thing. I'm just that good :D . We got a foxy boxer on the site. That's cool. I think I've met the most deverse (perverse, which ever :devillaug ) buch of people on this site then anywhere else.

You want a 46 year old for pictures???... Only if I can wear the gloves I wore in my last pro fight :shocked2:

I'm sure we can fit the gloves in somehow ;)
40 something Brittany Spears huh? I DO have a thing for her :shhh:

Sorry Stoneage, it seems these boys have forgotten all about your timing problems. Boys will be boys...That sounds like a lot of advance for an idling engine, but the temp. seems about right.Although, a lot of advance will make an engine run a bit warm...Now, where were we on this calander thing? :offtopic:

Sorry Stoneage, it seems these boys have forgotten all about your timing problems. Boys will be boys...That sounds like a lot of advance for an idling engine, but the temp. seems about right.Although, a lot of advance will make an engine run a bit warm...Now, where were we on this calander thing? :offtopic:

The timing is ok and Angela, the engine runs COOLER with more advance, not warmer.
I wouldn't try to cross-apply service info from Northstar to previous version engines. Most if not all info will not apply. I'm on vacation so my reference material is at work and I can't look anything up, but FYI a PROM (Programmable Read Only Memory) is a replacable "chip" in the ECM. You can get PROMs (both stock and custom) from many sources including the dealer.

its all good guys and gals , im thankful for the help ive gotten so far so the off topic stuff dont bother me at all


ok took the numbers today while it was pinging

water temp is @ 224.6 f , when it wasnt pinging yesterday temp was 192

is that still ok ? if i remember right like 240 f is bad news

timing goes clear to 17 btdc @55 mph but still around 25-35 btdc at idle

air intake temp is @204 f @ idle and 185 f at 55 mph - no wonder why cold air intakes are worth ponys

weatherman says its 95 out today

Question Kat... Wouldn't too much advance make an engine be running on the edge of detonation and wouldn't that make an engine run warmer?

Oh, I forgot, if you want to see a picture of me, see if you can get into "The Scranton Times" archives. There is a picture of me in the sports section on Dec. 6th 1997 of me fighting Kate Sekules in the first womens pro fight in Scranton. My last name was Reiss then.I'm the blond on the right with the shoulder tattoo...

Question Kat... Wouldn't too much advance make an engine be running on the edge of detonation and wouldn't that make an engine run warmer?

Actually, detonation has no real effect on engine temp, engine temp has an effect on detonation though. That maybe what the problem is in this case. He's running a rather hot engine in rather hot ambient air. Depending on fuel and baro pressure, detonation maybe tough to avoid without some modifications to the car and/or fuel octane improver.

Years ago, many cars (mostly carburated ones) used a vacuum control valve that would allow full manifold vacuum at cold start-up, then reduce to "ported" vacuum once warmed up, and finally allow full manifold vacuum again in an impending over-heat condition. This was to improve driveability when cold, reduce emmissions when warmed up, and cool the engine if it was getting near over-heating.

We can go into the full-blown mechanics of it but to be honest, I'd probably have to hit my books first to brush-up on the theory before explaining it here. I'm sure I'd forget something and confuse us both ;)

Oh, I forgot, if you want to see a picture of me, see if you can get into "The Scranton Times" archives. There is a picture of me in the sports section on Dec. 6th 1997 of me fighting Kate Sekules in the first womens pro fight in Scranton. My last name was Reiss then.I'm the blond on the right with the shoulder tattoo...


Sorry, looks like the archives only go back to '98 :(

Sorry,
I should've also pointed out that the different vacuum levels were being applied to the distributor vacuum advance, and that they were not simply "ported" but also "restricted". I hope this didn't confuse anybody.

Now THAT'S what I like to see; a well thought out, lucid answer, by an informed individual. Thanks for that info. :thumbsup:

hell yah , good stuff katshot

i think over the next week or two ill try to get the coolant temps down , origianl coolant/themostat/rad cap in a 112,000 mi engine so i think if i get those done first then id be in good shape and maybe scrub 10-20 degress from the coolant temps

ok tonight im gonna test the EGR valve , apperntly my egr valve cant be vaccum tested so i have to do the 2k rpm test where i lift the diapharm or something , tomorrow im pulling the EGR valve and cleaning it, then going out to buy a new valve when i break the gasket on the old valve (damned parts stores), after i do this to no avail , im gonna wait untill the sonofabitch burns a piston

i cleand the egr tubes in the throttle body , did the GM upper engine cleaner , changed my plugs , wasted 2 weeks on coolant temp issues ,changed boath o2 sensors, changed cap and rotor , plug wires , 3 cans of injector cleaner ,looked for vaccum leaks ,by tomorrow i will have went thru the EGR system completly, i am just out of ideas now , im thinking the 4.9 was engineered from caddy to ping on sunny days , must be why there is no knock sensor

hey Stoneage, have you tried using a higher octane to rid yourself of the ping? I don't know what's sold by you, but here in the NY area Sunoco has a 94 octane....just a thought...

yah , running 93 , round here there isnt anything higher , but shes packin 104+ octine booster so maybe thatll help

"104" only brings the octane up one point to 93.1.Not much of a boost at a dollar something a pint. It's made of tuolene and xylene, both petroleum distillates. They go for $5.00 a gallon in the paint store. That's what I have to mix with the gas when I get the 11:1 compression 425 on the road. Either that or buy racing fuel at $6.00 a gallon...I thought I heard a ping in my '95 DeVille 4.9 but using the Sunoco 93 for awhile and I don't hear it anymore. I use other brands now but always 93 octane and now I never hear it....I forget the formula exactly, but the tuolene is something like 1 gallon to 20 gallons of gas would raise 93 to 94. I have it written down somewhere, if you want to try it I'll dig it out for you.

well angie , i appricate the idea , but im just trying to get the thing to run on 93 , useing the octaine booster to try to see if anything happens ( like a small decrese in ping )

but i didnt know it only raised it that little , i think i wasted my money :(

hopefully after a couple of beers (my octaine booster) ill get somewhere with the EGR and solve it , just my prides taken a beating over this one , i used to be a airforce firetruck mechanic wasnt much i couldnt fix but this caddys got my number

wonder if leaky injectors are the cause ....not sure how i would test those in the car without some kind of pressure gauge and factory specs

Don't feel bad, we've got a 1953 Dodge M-37 personel carrier that constantly gives us brain stumping headaches. As for the money spent on 104 you're not the only one that doesn't fully know what up with that stuff; that's how they stay in business. Whenever you need specs, I have the manuel from Helm Inc. It's a bit expensive ($125.00) but has everything in it. I can always send you specs. :cheers:

cool, thanks :)