Alright gents im at wits end on this.. Its the number 5 cyl.that has the miss,,new plugs ,plug wires , cap,rotor, compression check, injectors,egr and egr tube,..put in stainless steel vacuum lines..came off the hwy one evening after work and it was missing..now seems to be only missing at idle and low rpm..could this be an exhaust gasket leak???
Have you tried a running compression test? Compare it with another cylinder. If there is a valve or camshaft lobe problem, it will show up. Sounds like you have covered all the other item. Also spray around with carb cleaner to check for vacuum leaks.
I was wondering if the conventional oil or whatever was in the engin was a heavier weight, and therefore not leaking, but then the synthetic oil was lighter.
Loren, are you sure you're getting a good spark on that plug wire? I know you replaced a bunch of stuff that should've fixed that, but perhaps somehow that's the issue.
I was wondering if the conventional oil or whatever was in the engin was a heavier weight, and therefore not leaking, but then the synthetic oil was lighter.
The synthetic oil and the conventional oil was 5w30. I've heard of this problem before. They say the synthetic oil cleans the residue from under the seal and it starts to leak. I'm not sure about that statement though. Anyway you look at it, I have a leak. Leaks and rattles really bother me. I can't put up with either
lyea i did the compression check over all three cyls on this side of the engine.and yes i have switched the plug wire from one cyl to another,,have u heard of and exhaust gasket leak causing this issue
installed new injectors and the stainless steel vacuum lines from Drew ( one was a duplicate) only to fine on tear down that the egr tube flange was split in two pieces..ordered a new one from Rodney
ummm... was it not a complete set?, sorry, do you need some return on the purchase
lyea i did the compression check over all three cyls on this side of the engine.and yes i have switched the plug wire from one cyl to another,,have u heard of and exhaust gasket leak causing this issue
I wasn't talking about a compression test. I was saying a "running compression test". that is testing the cylinders while the engine is running. Take the check valve out of the hose and screw it in the cylinder. Run the engine for a short time while reading the gauge. Then compare it to another GOOD cylinder. If both cylinders are the same then that's in good condition. Some times there is a mechanical problem such as a rounded lobe on the camshaft that will not show up on just a compression test because the valve would be closed all the time. I have never heard of an exhaust leak at the manifold causing a cylinder to be dead
[This message has been edited by notwohorns (edited 03-13-2015).]
I wasn't talking about a compression test. I was saying a "running compression test". that is testing the cylinders while the engine is running. Take the check valve out of the hose and screw it in the cylinder. Run the engine for a short time while reading the gauge. Then compare it to another GOOD cylinder. If both cylinders are the same then that's in good condition. Some times there is a mechanical problem such as a rounded lobe on the camshaft that will not show up on just a compression test because the valve would be closed all the time. I have never heard of an exhaust leak at the manifold causing a cylinder to be dead
aaaa i see what your saying..no have not done that. maybe a valve not seating or a broke rocker arm stud.no Drew all is good
sorry peoples I have not been around lately. I have had a lot going on with the purchase of a new home, doing repairs to get it move in ready then moving. all the while prepping the old house for renting.
lyea i did the compression check over all three cyls on this side of the engine.and yes i have switched the plug wire from one cyl to another,,have u heard of and exhaust gasket leak causing this issue
when you switched the plug wire did the problem move or stay with cyl 5?
Alright gents im at wits end on this.. Its the number 5 cyl.that has the miss,,new plugs ,plug wires , cap,rotor, compression check, injectors,egr and egr tube,..put in stainless steel vacuum lines..came off the hwy one evening after work and it was missing..now seems to be only missing at idle and low rpm..could this be an exhaust gasket leak???
Copied from ZMCDONAL thread. I finally figured out what was causing the misfire, I took my stethoscope to listen to each the injector pulse and make sure I didn't have a stuck injector and I discovered vacuum leaks at the injector o-rings. so $12 later and about an hour of my time and it runs like a totally different engine. The o-ring on injector 4 was really torn up, the rest of them looked to be in good shape, but must have not been seated properly or something. The new o-rings were beefier and the autozone listing said they were an improved design.
I hope you guys have more to show for your efforts than I do. I broke the plastic rivet that holds the hood spring. I halfway rebuilt my headlight motors (gaskets & cogs), but the screws didn't arrive today. I still can't find a jack mount bracket bolt. I didn't find a cap for my AC dryer. I didn't get the wiring harness under the dash fixed. I didn't get the dash put back together. Since my new relays also didn't arrive, I have the old relays out, but nothing to put in. My exhaust manifolds look rusty, but it didn't seem to be my day, so I didn't touch them.
Very frustrating. Not one single thing accomplished. Well, I guess I did air up the tires.
To show for my efforts, I have cuts, bruises, a broken nail, electrical tape gooey residue all over my hands, parts everywhere, and lots of wire under my dash.
Had one of those yesterday and part of today with the lousy valve spring compressing tool. The pacifica exhaust spring are long and barely fit in the tool, glad that part is over, pistons and crank back in also. Didn't get around to burning the bushing out of the fiero.
[This message has been edited by LornesGT (edited 03-15-2015).]
WELL HELL sad day for me 1st i turned 51 today lol..Second found it is a blown head gasket as there is gas in the oil...So heres the ?..if it were you? option one: fix w/ new heads option two: do the easiest swap there is ( i dont know which that is by the way) option three: S/C 3.8 or sbc
ran s second comp check on the right cly today and they were 105, 35, 0 .lol
ty tshark..its gas ive have had a gasket break just enough to push the gas out into the oil passageway before , well it was a friends vega..either way it sucks.like to find some new ones or just do a swap..but i dont think i could do that by myself
Happy Birthday mine was the 11th turned 53. You already have another Fiero, I vote 3800 but I don't want to spend your money. You could swap my 2.8 in maybe when i get it out. It has 109000 on it if it is the original. Not sure what it is worth but I am thinking cradle, tranny and all that is if I run into a cradle. I did pull it and gasketed and new clutch. Just a thought and not sure when I would have it ready.
Happy b-day Loren. You could just send the head out and have it checked for cracks and for being warped. It could just be a head gasket that is bad. If it didn't over heat I doubt if you have a bad head.
[This message has been edited by notwohorns (edited 03-17-2015).]
I got one so hot it quit running. After it cooled off, I fixed the leak, and drove 1.5 hours home. I removed the 2.8 for a 4.9. Gave the 2.8 away. The new owner just pulled his high-mileage 2.8 with a thrown rod and put my 2.8 in. He had it running the same day. He's put over 30K miles on it, last I heard. That motor had 130K on in when I gave it to him.
The motor I will have for sale is the one I am currently running in my car, it will not be coming out until late next fall for a winter car refurbishments.
The motor I will have for sale is the one I am currently running in my car, it will not be coming out until late next fall for a winter car refurbishments.
Also a bit late but HAPPY BIRTHDAY all the same.
I think I already asked but do you have any stock rockers for the 3800 lying around?
The weather is improving, and people are starting their Spring thing. Driving/working on Fieros, all the fun stuff. NI even took mine out for a drive. The brakes work MUCH better when adjusted correctly.
Where have you all gone? Lorne, Loren, notwohorns?
I hope notwohorns didn't get swallowed by his new project.
No, I'm still here. Just with spring being here and all the yard work, been keeping me busy. I had one hell of a time trying to register my new GT. It was in a trust. I had to have the correct paper work and it took me several tries with the PO and the DMV. Finally got it done last Tuesday. I've be holding off working on it til I could get it registered. All good now. Michael, when did you say you're going up to the Dells?
