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My '97 3100 Malibu with 118K miles has the leaking IMG problem. I got it tore down to the lower IMG and I can see where the gasket was cracked on the radiator-side head at the transaxle. It leaked at the transaxle mostly but seems to have been leaking at the front too. None of the LIMG bolts were very tight so I think it had a vacuum leak too and might explain why the car didn't run quite as smooth as it should.
I've checked fuel pressure and it was 41 psi and holding. I checked compression and it was 180 on all cylinder but cylinder 6 was about 162-170. I think this is the slightly defective from the factory piston that cause the "piston slap" when cold. Anyway, my headgaskets and engine's mechanic condition should be good.
I'm using Fel-pro PermaDry Plus with new bolts. I'm putting in all the other new parts like the thermostat and plugs. The Dex-cool caused no internal corrosion, so new Dex-cool is going back in.
I also bought 6 new AC Delco injectors. I didn't want to spend that much money ( I'm up to about $500 now) but I figure injectors are only expected to last about 150K and it's too much trouble getting to them to have to replace any of them later. Plus despite cleaning them, I don't think my injectors ever worked quite right. I paid $270 for the injectors so I thought that was a good deal. What does anyone else think?
I'm somewhat experienced and very knowledgable at auto repair and the only thing so far that has slightly tripped me up was the O2 sensor at the firewall. It has a blue plastic cord that loops into the connector and holds the sensors pigtail wire away from the exhaust. The connector was secured by a push pin molded into it that went through a bracket on the DIS. I couldn't see how the connector would disconnect without breaking the loop. I was trying to pull the push pin out and I broke it off. Then I could see where the O2 sensors pigtail probably could've been disconnect before the blue wire cord and unlooped, but the other side of the connector looks like it's still locked together with that blue cord that the O2 sensor pigtail looped through. It would seem like the connector would've had to come off the DIS mount or disconnected at both ends before the DIS could've been remoived. Like I said, I broke the push pin off where it mounted to the DIS, so now I need to fix the connector mount so my O2 sensor wire wont be laying on the exhaust. Fixing GM weather pack connectors is not a skill I've picked up as of yet. How are people getting this O2 sensor connection apart without breaking it???
I've checked fuel pressure and it was 41 psi and holding. I checked compression and it was 180 on all cylinder but cylinder 6 was about 162-170. I think this is the slightly defective from the factory piston that cause the "piston slap" when cold. Anyway, my headgaskets and engine's mechanic condition should be good.
I'm using Fel-pro PermaDry Plus with new bolts. I'm putting in all the other new parts like the thermostat and plugs. The Dex-cool caused no internal corrosion, so new Dex-cool is going back in.
I also bought 6 new AC Delco injectors. I didn't want to spend that much money ( I'm up to about $500 now) but I figure injectors are only expected to last about 150K and it's too much trouble getting to them to have to replace any of them later. Plus despite cleaning them, I don't think my injectors ever worked quite right. I paid $270 for the injectors so I thought that was a good deal. What does anyone else think?
I'm somewhat experienced and very knowledgable at auto repair and the only thing so far that has slightly tripped me up was the O2 sensor at the firewall. It has a blue plastic cord that loops into the connector and holds the sensors pigtail wire away from the exhaust. The connector was secured by a push pin molded into it that went through a bracket on the DIS. I couldn't see how the connector would disconnect without breaking the loop. I was trying to pull the push pin out and I broke it off. Then I could see where the O2 sensors pigtail probably could've been disconnect before the blue wire cord and unlooped, but the other side of the connector looks like it's still locked together with that blue cord that the O2 sensor pigtail looped through. It would seem like the connector would've had to come off the DIS mount or disconnected at both ends before the DIS could've been remoived. Like I said, I broke the push pin off where it mounted to the DIS, so now I need to fix the connector mount so my O2 sensor wire wont be laying on the exhaust. Fixing GM weather pack connectors is not a skill I've picked up as of yet. How are people getting this O2 sensor connection apart without breaking it???
? I bought new bolts partly figuring I wouldn't have to buy threadlocker too. Does anyone know if the GM version has threadlocker on all bolts? Should I put it on the other 4 or will it be OK with out it?
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