PDA

View Full Version : need help asap!!!



nscmd2b
07-27-2013, 11:51 PM
have a 91 tbird sc and put a new engine in it. i get it started but it wont stay on unless im reving up the engine. what does this mean? what should i do?

LIVipers
07-27-2013, 11:53 PM
Look for vacuum leaks, they can be a big time cause of problems

nscmd2b
07-28-2013, 12:02 AM
ok maybe its the inner cooler. girlfriend said it didnt look right but she doesnt know really anything bout cars. also i havent started this car for 7 years. would that have anything to do with it?

nscmd2b
07-28-2013, 12:06 AM
i got a rebuilt engine afew years ago and finished it today. now it starts right up but again wont stay on in idle. i think it might be inner cooler but would there be anything else?

elanoresc
07-28-2013, 01:04 AM
Yeah number of things starting with vacuum leak to idle air controller to crank sensor to o2 sensors to plugs and wires is it throwing any codes or is engine light on

TbirdSCFan
07-28-2013, 01:23 AM
i got a rebuilt engine afew years ago and finished it today. now it starts right up but again wont stay on in idle. i think it might be inner cooler but would there be anything else? IC tubes are the most common cause of vacuum leaks. Easy to do.. just use a sealant on where they meet and tighen up evenly a bit at a time. Leave things loose and tighten up each a bit at a time until done. Check for loose vac hoses and any open fittings.

nickleman60
07-28-2013, 07:55 AM
IC tubes are the most common cause of vacuum leaks. Easy to do.. just use a sealant on where they meet and tighen up evenly a bit at a time. Leave things loose and tighten up each a bit at a time until done. Check for loose vac hoses and any open fittings.

I used the reusable teflon gaskets for years and they worked great.

http://www.ebay.com/itm/Super-Coupe-InterCooler-Gasket-set-of-4-Thick-Teflon-/271170447377?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f2304a811&vxp=mtr

nscmd2b
07-28-2013, 09:53 AM
im using the teflon gaskets. some people say that a little bit of rtv on them is a good idea but didnt use any

nscmd2b
07-28-2013, 12:22 PM
the crank senor is brand new put it in right before starting it up. the engine light was on at first but then it turned off.

TbirdSCFan
07-28-2013, 12:41 PM
im using the teflon gaskets. some people say that a little bit of rtv on them is a good idea but didnt use any Use one or the other but not both. Id look very closely at the back of the intake for open fittings or loose hoses. Dont forget there are vac lines that run through the firewall to the boost gauge, cruise control, and to the A/C control panel. If you did any work on the dash recently.. theres where you need to look.

Check the order of the plug wires on the coil pack. Pattern is:

(back)
123
564
(front)

nscmd2b
07-28-2013, 01:25 PM
well now the car idles smooth but when i give it some gas it dies.

nscmd2b
07-28-2013, 01:27 PM
also checking the inter cooler checking the bolts ect

LIVipers
07-28-2013, 01:33 PM
Check the MAF sensor connection as well. I accidentally forgot to plug it in on my car one time after doing some work and it didnt run for anything

nscmd2b
07-28-2013, 07:09 PM
ok i tried it and the MAF sensor is fine but it still starts to shutter and die when giving gas

LIVipers
07-28-2013, 07:33 PM
I replied in your other thread, but confirm fuel pressure at the rail using a gauge. You would screw it into the schraeder valve on the rail just right (drivers side) of the supercharger

nscmd2b
07-28-2013, 07:40 PM
i actually dont have one of those. but the engine is remanufacture i bought it from super coupe performance

LIVipers
07-28-2013, 07:51 PM
Locate a gauge, either locally or from SCP, and observe fuel pressure at idle and when you give it gas, and take it from there

nscmd2b
07-28-2013, 08:13 PM
so theres nothing else you can think of?

elanoresc
07-28-2013, 08:26 PM
fuel spark air sums it up more than likely its a fuel problem if its getting spark there is a ring on tank holding fuel assembly on if that's not on it wont get proper fuel

nscmd2b
07-28-2013, 08:37 PM
see we have 2 of the same cars so what im doing is everything everyone is telling me i switch it from the other car to see if it works. ad so far everything is working. just wondering but would having the car on a jack effect anything like i olny have a little more than a quarter tank of gas and right now its on a jack to where the two front tires are off ground. whould that have anything to do with it dieing when giving it gas?

elanoresc
07-28-2013, 08:51 PM
No it shouldn't but bad fuel and water in the tank will also if pumps old could have a flat spot that will make it cut in and out try new fuel with that crap to dry your gas

nscmd2b
07-28-2013, 09:00 PM
its not that i already took out the old gas and put in new gas.

elanoresc
07-28-2013, 09:10 PM
You say you have another sc next to you check and make sure plugs are in right firing order from there check fuel pressure from there check injectors sounds like your not getting full spray another thing you can do is post your area some good people here one might come help you out

nscmd2b
07-28-2013, 09:18 PM
ok so would i just make a new thread asking if anyone can come over and help?

elanoresc
07-28-2013, 09:23 PM
Yeah you can just say help in ...... you might get a hit

nscmd2b
07-28-2013, 09:26 PM
ok thanks going to drive it to gas station and go from there

SmokinTbirdSC
07-28-2013, 09:38 PM
Did you put a new fuel filter in?

elanoresc
07-28-2013, 09:44 PM
if its not throwing any codes at you I would say its something to do with the fuel or something with out electronics you said something bout being new block are push rods in right spots are rockers torqued properly and set on valves right

TbirdSCFan
07-28-2013, 10:51 PM
A KOER test is kind of tricky, but IF you can get it to run it, the last part is cylinder balance (as long as you floor the pedal after the last flash after the codes) and it will take over the engine and cycle spark/fuel and MAYBE give you some direction.