Hi all.
I've been having some issues with performance. It's very noticeable when going up hills. I'm barely able to keep the speed up while going up a moderate hill. Sometimes after climbing a hill (highway) I can smell a burnt smell from under the hood.
I've done some searching, and this is what I've gotten so far:
* Compression: Equal, and well within range (maybe it took a while to build up)
* Fuel rail pressure: good
* Spark plugs looks visually good to me. They all look the same, no buildup
* Exhaust backpressure < 1PSI
* Air filter and intake is not blocked
* No error codes
* I did a sea foam treatment trough the intake
While poking around, I did find that my exhaust manifold was cracked. While replacing that, I also cleaned up the intake manifold and replaced the fuel injectors.
I feel pretty confident that I did the tests correctly. This is the first time doing a compression tests. Even though I followed the intersections, there is a chance I missed something.
One interesting thing happened yesterday that made me think more about this. With the engine off, stopped on a relatively minor incline and in first gear, the rig started slipping backwards. It was a jerky movement, like engine was being turned over. This is a new thing. Having it in gear used to be able to hold it in place. I know I'm not supposed to park without the e-brake, but that's not the point. The point is that something appear to have changed WRT the engine. This makes me think that the compression is not great.
I know that my axle gear ratio is a bit low, but I have a hard time believing that's the root cause here. I noticed this issue a while after putting the lift on, and I feel like since it's a manual I'm able to compensate for the axle ratio.
Details about the rig:
* 4.5" lift w/31" tires
* 3.07 Rear Axle Ratio
* V6 engine
* '99 with 185k miles
* Manual transmission
At this point, I'm out of ideas. The only next steps I can think of is to start over again, or just give up an take it to a mechanic.
Any suggestions what to do next?
I've been having some issues with performance. It's very noticeable when going up hills. I'm barely able to keep the speed up while going up a moderate hill. Sometimes after climbing a hill (highway) I can smell a burnt smell from under the hood.
I've done some searching, and this is what I've gotten so far:
* Compression: Equal, and well within range (maybe it took a while to build up)
* Fuel rail pressure: good
* Spark plugs looks visually good to me. They all look the same, no buildup
* Exhaust backpressure < 1PSI
* Air filter and intake is not blocked
* No error codes
* I did a sea foam treatment trough the intake
While poking around, I did find that my exhaust manifold was cracked. While replacing that, I also cleaned up the intake manifold and replaced the fuel injectors.
I feel pretty confident that I did the tests correctly. This is the first time doing a compression tests. Even though I followed the intersections, there is a chance I missed something.
One interesting thing happened yesterday that made me think more about this. With the engine off, stopped on a relatively minor incline and in first gear, the rig started slipping backwards. It was a jerky movement, like engine was being turned over. This is a new thing. Having it in gear used to be able to hold it in place. I know I'm not supposed to park without the e-brake, but that's not the point. The point is that something appear to have changed WRT the engine. This makes me think that the compression is not great.
I know that my axle gear ratio is a bit low, but I have a hard time believing that's the root cause here. I noticed this issue a while after putting the lift on, and I feel like since it's a manual I'm able to compensate for the axle ratio.
Details about the rig:
* 4.5" lift w/31" tires
* 3.07 Rear Axle Ratio
* V6 engine
* '99 with 185k miles
* Manual transmission
At this point, I'm out of ideas. The only next steps I can think of is to start over again, or just give up an take it to a mechanic.
Any suggestions what to do next?