1999 Camry misfires at 4200 rpm
#1
07-25-2011, 12:06 PM
1999 Camry misfires at 4200 rpm
The mechanic is stumped.
We very recently had the engine replaced on our 1999 Camry (V4). (it had 110,000 miles on it). There were some issues with the repair that have been resolved, but our mechanic is having a very hard time solving a problem. The car has been in the shop since Monday.
What could cause the vehicle to misfire once it hits 4200 rpm (and does not go any farther)? Otherwise the vehicle drives fine (according to our mechanic). It is not the crankshaft sensor as it produced the expected square wave. They were pretty confident on this being the source of the problem on last Tuesday evening.
The timing belt is is not the issue.
The original mechanic does not know the exact year of the engine, but it is matched based on the vehicle VIN when the part is sourced. The manager said it was probably the 2.2L engine and within a year or two of 1999.
The engine meets federal emissions standards, not California (as would be expected).
They used the existing wiring harness from our car as it is part of the engine block.
In talking to the mechanic on Friday, he mentioned that the MAP sensor was reading 5-6 Volts? mV? (whatever the units are, but he said it was voltage) high. So the vacuum in the engine at this level rpm (4200) is too high.
One of the problems is testing it at this rpm level since it is accelerating at highway speeds that causes it. Another problem is that there are no error codes.
We very recently had the engine replaced on our 1999 Camry (V4). (it had 110,000 miles on it). There were some issues with the repair that have been resolved, but our mechanic is having a very hard time solving a problem. The car has been in the shop since Monday.
What could cause the vehicle to misfire once it hits 4200 rpm (and does not go any farther)? Otherwise the vehicle drives fine (according to our mechanic). It is not the crankshaft sensor as it produced the expected square wave. They were pretty confident on this being the source of the problem on last Tuesday evening.
The timing belt is is not the issue.
The original mechanic does not know the exact year of the engine, but it is matched based on the vehicle VIN when the part is sourced. The manager said it was probably the 2.2L engine and within a year or two of 1999.
The engine meets federal emissions standards, not California (as would be expected).
They used the existing wiring harness from our car as it is part of the engine block.
In talking to the mechanic on Friday, he mentioned that the MAP sensor was reading 5-6 Volts? mV? (whatever the units are, but he said it was voltage) high. So the vacuum in the engine at this level rpm (4200) is too high.
One of the problems is testing it at this rpm level since it is accelerating at highway speeds that causes it. Another problem is that there are no error codes.
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