New 331 but will not stay running?????

N

njb2345

Founding Member
Aug 24, 2002
98
0
0
Edison,NJ
#1
Ok guys, i just put my new 331 in my car this week. I went to go start it and it was popping out of the intake, can't rev the car up, and the whole engine is shaking really bad. So i first check the timing, i put my finger in the #1 spark plug and waited till the piston came up and then positioned the balancer to TDC (0 degrees) and placed the dist. down to where the 1 is on the dist cap (straight back towards the firewall) started it again and same thing. Running really ruff, popping, and not wanted to stay on ans also can't reve it really high. So after that I said back it is 180 degress off and swap the dist again and it just popped thru the intake and didn't start. So i put it back to where it was and got it running again and sprayed break clearer around the intake and other vacium lines but nothhing that I can see. Also the water temp is not that bad around 190 but the engine is hot as hell.. I also unplugged all the sensors and replugged them in, and the injectors too....Please throw some idea to me because I am out of ideas......Thanks

Nick

P.S. it is R302 but i don't think that it matters...
 
#4
timing

you have to set the timing remember you have to set timing on the second stroke also put the 0 or tdc on the pointer try. Turn the engine 360 degrees and set the distributor and crank it it does not crank turn engine again and set the distributor again make you that you have the firing order good remember mustang are H.o so H.o has different firing order than 5.0L
 
#6
ucanbeatme- Yes i have oil pressure, it is around 50-60 pressure when the car is at like 1k.

dany5.0- The firing should be right, i even looked at my other mustang to make sure. My other mustang is a 306 s/c putting 540 to the wheels, and the fire ording is the same on both cars. Also when they are both on tdc and 0 the roter on the dist is in the same spot.

88stangmangt- I will check the firing order again....Also i got the pluges gapped to 34 right now......I am going to check again tomorrow for all vac hoses and i will also check the pcv but i think those are all good.

Do you guys think that it has anything to do with my rockers, i have 1.6 rockers on Victor Jrs. heads. So they are adjustable but the engine builder put them on.....I just want to thank all of you guys for the advice and keep it coming and I will let you know what I come up with tomorrow....


Thanks again
Nick
 
#7
You said you had your engine built by some one? If so i would complain and ask whats goin on. If you want you could find out how tight the nuts on the rockers have to be and torqe them down your self. and you might as well go though and tighten everything else up, just for "safety"
 
#8
What do you guys think about this at all, someone told me that if the cam is for a 351 you need to use the 351 firing order. BUt on the cam card it doesn't say 351 but is that truw about the 351 cams inside a 302/331 engine, to use that firing order.

Thanks
Nick
 
#9
i'm 99% sure that the 351 uses the 302H.O. firing order. But you may want to double check that for sure. Also I don't know if all year 351's have stayed with the same firing order. You can probably find out from the people you got your cam from. Or, pull your valve covers off and turn the crank by hand with a ratchet and watch your valves to see what is going on when.

This does rather sound like a firing order or a timing problem. It would suck if your cam wasn't degreed properly which isn't impossible.

I would also do like that other guy said and get on the horn with your engine builder if they were supposed to give you a turnkey engine.
 
#11
I had the same issue on my 331 when it was on the dyno. My comp cam is
ground on the old 289/302 firing order not the H.O order. I believe that is the case with alot of the stroker cams. Try the old firing order.
 
#12
OK i will try the older firing order. Also i am going to set an appointment with my tuner, LaRocca's and see what they pull up before i say anything to the engine guy. Thanks for all the help guys and I will keep you posted...

Nick
 
#13
2muchtime said:
id be willing to bet its the firing order..or your calibrated fuel injectors are firing at the wrong time..
Click to expand...


the stroker kits use a different crank which use the old school firing order
68-81 ford 302, just cant remember it off the top of my head :bang:
 
#15
2muchtime said:
the stroker kits use a different crank which use the old school firing order
68-81 ford 302, just cant remember it off the top of my head :bang:
Click to expand...

Yeah, the cam makes the firing order, not the crank, I'd put my money on you have a non HO cam. That means you have to change the injector harness around too doesn't it?
 
#16
Js5ohLX said:
Yeah, the cam makes the firing order, not the crank, I'd put my money on you have a non HO cam. That means you have to change the injector harness around too doesn't it?
Click to expand...

Yeah the cam determines the firing order, but the crank has got as much to do with it as the camshaft does. If you just slap any old camshaft in there with any firing order you like, your going to end up with the valve event timing for a given cylinder not matching the piston's cycle in that cylinder.
 
#19
try unplugging the maf when the car is running see if it smooths out.
you will induce a code but ignore it.
having a sc calibrated maf will obviousy affect the way the car runs.


(sorry i meant to say cam not crank)


jeez you all chime in when i make a missttaakke
thanks for all the corrections :rolleyes:
 
#20
OK some good news but some bad news. I brought it to the place where I get my car tuned at and they looked at it and they told me it is def the timing off, so they thought that the balancer was not right, so they indexed it and fixed that problem. Now the dist was off 1 tooth, so they move it back to the right spot and it still seemed like it was still not good, so they took out the spark plug again and put different ones in there and it seems that the spark plugs were making it not run right, even tho they where brand new. So I drove the car home and it had no problems, (Also I put the S/C back on becz they wanted it on to do some testing) So i left the s/c on for a day or so and i was driving around my house and at around 2000 rpms the car was like spuddering/bucking, it didn't want to go and it was poping thru the exhaust it sounded like, but if you get on it, it goes away. So i drove it around some more and it didn't do it again.....Now the engine guy told me to leave the S/C off till like 1k miles, so I took it back off and 2 days later the car is doing the same thing bucking/spuddering at lower rpms, like driving around town normally. What do you guys think, also the tranny is leaking from the output shaft even after 2 seal changes. I am about to lose it on my car, it is really starting to get to me.. Let me know what you guys think.

Thanks
Nick
 
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