Need Help! Car Misfires!!!

[EagleTalonRacer]

wasup dudes I got a problem.. well. I was driving an up hill freeway going around 70 in 5th gear when I felt a loss of power, I thought it might've been the wind because it was windy during that night but I just hit the gas even more and it still was losing power, so I pulled over and let it idle but it just turned off. I opened the hood the engine wasnt overheating at all but the exhaust maninfold was glowing red.. so then I started it up to let the turbo cool down but it had a hard time starting. once it started it idled erratically and rough, it sounded like a hot rod that was tuned so then I checked the tail pipe to see if anything was coming out but nothing just clean combustion and i thought I blew the gasket and I didnt. then I drove the car on the streets home but it was running very rough but the next day I took it to my mechanic.. the timing was perfect then I ran a compression test with his tools and cyl 1 got 190 psi, cyl 2 got 40 psi cyl 3 got 0 PSI!! and cyl 4 got 40 psi.. so then I took it home and I took the head off and guess what 2 valves were cracked and one had a hole in it and it was cyl 3 exhaust valve. so then I got it serviced and a valve job, I put the head back on with the proper tools in my garage and it took me about 3 days. once everthing was put on I turned the ignition and the car still RAN the same.. still misfiring..what should I do!? whats there that is left? fuel filter? injectors? I just bought this car and broke down in less than 7 days..

 

[kalla]

I am going to assume (maybe or maybe not a good idea) that there was no prior damage to piston rings or anything else in the bottom end. That you say you just bought the car suggests that there might be some other issues lurking below but let's not go there right away. I'll also assume that the head was reassembled properly.

Removing and installing the head is not a trivial deal, so you gotta be sure there are absolutely no loose vacuum lines or boost leaks anywhere. Use a pressure tester to verify there are no leaks.

Next be sure the timing belt is installed right, and that the base timing is set correctly. My Talon ran like crap when the base timing got off.

Have you also verified the fuel system is operating correctly? I ask this because you say you just bought the car.

Good luck ..

 

[DevilSperm]

make sure that CAS is on correctly

 

[EagleTalonRacer]

well I just turned on the car right now and it smells like gas right out of the tailpipe, im gonna check the fuel lines and filter right now.. ill update

I am going to assume (maybe or maybe not a good idea) that there was no prior damage to piston rings or anything else in the bottom end. That you say you just bought the car suggests that there might be some other issues lurking below but let's not go there right away. I'll also assume that the head was reassembled properly.

Removing and installing the head is not a trivial deal, so you gotta be sure there are absolutely no loose vacuum lines or boost leaks anywhere. Use a pressure tester to verify there are no leaks.

Next be sure the timing belt is installed right, and that the base timing is set correctly. My Talon ran like crap when the base timing got off.

Have you also verified the fuel system is operating correctly? I ask this because you say you just bought the car.

Good luck ..

 

[civickiller]

well I just turned on the car right now and it smells like gas right out of the tailpipe, im gonna check the fuel lines and filter right now.. ill update

could be your plugs.

 

[EagleTalonRacer]

could be your plugs.

I just replaced the plugs, with NGK's brand spankin new, I mean if it was piston rings wouldnt it spit out white smoke? I mean I dont know when was the last time the fuel filter was replaced the car has 160,000 miles already

 

[DevilSperm]

just so i know, did you check the cas?

 

[EagleTalonRacer]

just so i know, did you check the cas?

DAMN im such a Newbie, whats CAS

 

[DevilSperm]

http://members.shaw.ca/dsm.1000q/Engineprimer/1G/cas.htm

i had a similar problem...bent valves so i swapped heads and it ran the same...turned out my cas was just backwards....

180 out

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correct...this is at TDC

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[EagleTalonRacer]

http://members.shaw.ca/dsm.1000q/Engineprimer/1G/cas.htm

i had a similar problem...bent valves so i swapped heads and it ran the same...turned out my cas was just backwards....

180 out

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correct...this is at TDC

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hmmm... my car doesnt have that , I just have gasket to cover up that hole

 

[DevilSperm]

oh shit sorry, youre a 95...my bad....i forget to look sometimes

 

[EagleTalonRacer]

I just replaced the gas filter yesterday and it made a minor difference, but the car is still misfiring and my boost goes on a off while accelerating... HELP!!!!!!! what next? compression test again?

 

[gsxboostin]

check your plug wires, they may be shot, also check the connections of the plugwires on the coil pack and plugs, and check the harness plug connection that plugs into the coilpack.

 

[EagleTalonRacer]

check your plug wires, they may be shot, also check the connections of the plugwires on the coil pack and plugs, and check the harness plug connection that plugs into the coilpack.

I did all that bro.. but I just took it to my mechanic yesterday and I ran another compression test and cyl 3 got 0 psi and i noticed since I cleaned the head the exhaust manifold is surrounded by oil from cyl 3, piston rings? or head that is messed up

 

[gsxboostin]

If you got 0 psi then it's most likely your piston rings, but no matter what now, you should pull your head off and check it all out. Check the cylinder walls on cyl. 3 for scorching, and grooves. also check the area around the valves on that cyl. Thats all I can think of right now, i just woke up haha :laugh: . let me know -Matt

 

[Bigglesworth87]

I know this is such a newb question but are the plug wires in the correct order? Maybe you have two of them switched? I dunno, you said you checked that already but you never know.

 

[EagleTalonRacer]

I know this is such a newb question but are the plug wires in the correct order? Maybe you have two of them switched? I dunno, you said you checked that already but you never know.

haha I did that like everytime when I worked on the car I checked the wires if they had spark from the coil packs and to the spark plug and of course there's spark.. then I got NGK's and gapped them to .033 the book says you can gap them in the range of .028 through .033. But when i removed the spark plugs cyl3's spark plug was coated with oil and the others were dry and clean compustion I did the timing after 5 times of reading the book and putting it right on target, but once it was all done, I turned the crank with my 1/2 inch drive ratchet and there was no difficulty turning the crank OF COURSE IN THE RIGHT direction too so I guess the next thing to do is to remove the whole thing again

 

[t0taleclipse]

I have simalar problem. No smoke out tailpipe and cylinder 2 has 30psi of compression. I think i have a bad valve. My cars exhaust can get ya high with one sniff and I have terrible gass mileage. The car studders at low RMP and there is a loss in performance.

Suggestion:

Try a leak-down test to see where the problem is. Valves it could be (intake or exhaust valves), headgasket or rings.

 

[EagleTalonRacer]

If you got 0 psi then it's most likely your piston rings, but no matter what now, you should pull your head off and check it all out. Check the cylinder walls on cyl. 3 for scorching, and grooves. also check the area around the valves on that cyl. Thats all I can think of right now, i just woke up haha :laugh: . let me know -Matt

I just got some news from my mechanic.. its good news he adjusted something with the valves in cyl3 and now it runs like a healthy turbo breathin beast! ill tell you later what he did hes gonna give me all the details once I get over there

 

[EagleTalonRacer]

I have simalar problem. No smoke out tailpipe and cylinder 2 has 30psi of compression. I think i have a bad valve. My cars exhaust can get ya high with one sniff and I have terrible gass mileage. The car studders at low RMP and there is a loss in performance.

Suggestion:

Try a leak-down test to see where the problem is. Valves it could be (intake or exhaust valves), headgasket or rings.

hey thanks for the help! but I think I got the problem fixed

 

[gsxboostin]

EagleTalonRacer, what fixed it? It's good to tell what fixed it after all the diagnosis and help, so when others have a similar or same problem they can search for it and find the answer. Thanks -Matt

 

[EagleTalonRacer]

EagleTalonRacer, what fixed it? It's good to tell what fixed it after all the diagnosis and help, so when others have a similar or same problem they can search for it and find the answer. Thanks -Matt

the mechanic said that one of the rocker arms was not getting in contact with the cam and so it was a dead valve! well thanks to all you guys for helping me out, see you all at the socal dsm meet PEACE!

 

[gsxboostin]

Ah ok thanks man , ttyl -Matt