- NEW!
by Tveg on April 10th, 2009
I ran out of space, so will continue here. It is the four cylinder engine.
The idle is a bit rougher. No check engine light is present. MPG suddenly dropped from 25 to 19 with the new belt. The acceleration is especially poor when the engine is cold. I would guess 0-30 in 8 seconds, with 0-10 probably taking 4 seconds. The engine runs very smoothly from about 3,500 on up. The car ran perfectly fine before the belt was changed, and had a fairly flat power band. The mechanic is sure the belt was installed with correct phasing. The mechanic is claiming that some totally unrelated problem caused the drastic change such as the timing. It acts somewhat similar to a muscle car with a drag race cam - no bottom end, then suddenly comes into the power band. If driven with a bit of load such as up a hill in third gear at 25 mph, the rpm will go up and down maybe 50 rpm (small surging at lower rpm's), but if downshifted to second gear, it runs perfectly smooth.
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You're reading Right after the timing belt was replaced on a friends '95 Camry, the power band of the engine changed drastically. I think it was installed retarded. Low end power up to 3000 rpm's is about half of what it was prior, but stronger 4,500 on up.
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Comments
That sounds more like advanced valve timing rather than retarded. I know on my FX-16, there are two sets of marks on the timing gears. Maybe the mechanic used the wrong ones. Pull the timing cover off and look. Just make sure that the crank pulley is at 0 degrees when you check.
by Brian on April 21st, 2009
Thanks! I'll try to take a look. Naturally, it is pretty close quarters. When I used to monkey with pushrod V 8's, we sometimes would retard the cam slightly for drag-strip use, and advance it for more bottom end if for street use (as per cam manufacturers, magazines, and local gurus). I really haven't messed with little engines much, so I am not very familiar.
by Tveg on April 21st, 2009
I was thinking it was the other way around, but I may have forgotten. Anyway, checking it out is necessary. On my FX-16 Corolla, I decided to leave the plastic timing cover off permanently. A friend also has the same engine in his Corolla, and has had the cover off for many years.
I just bought a '90 Camry and the engine seems to be set up almost identically. I don't know if it has two sets of timing marks also.
I was able to change the timing gears positions without loosening the tension pulley - this saves a lot of work. I could gently nudge the belt outward with a screwdriver, re-set the gears and then slide the belt back on. Hopefully the same method will work for you.
Let me know what you find out. Good luck.
by Brian on April 21st, 2009
Thanks again!
by Tveg on April 21st, 2009