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1999 Camry misfires at 4200 rpm
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nwstehle
New User
Jul 27, 2011, 6:31 AM
Post #1 of 11
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1999 Camry misfires at 4200 rpm
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What would cause a 1999 Camry to misfire/act up at 4200 rpm and above?
We very recently had the engine replaced on our 1999 Camry (V4; 2.2L; it had 110,000 miles on it) while on a trip. There were some issues with the repair that have been resolved, but our local mechanic is having a very hard time solving one last problem they found. The car has been in the shop locally since last Monday (7/18/11).
The mechanics that installed the used engine do 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’s (as would be expected). They used the existing wiring harness from our car, as it is part of the engine block. The only new parts listed were the water pump, plugs, wires and timing belt. So my guess would be that the other items were transferred from our old engine.
Otherwise the vehicle drives fine (according to our local mechanic).
It is not the crankshaft sensor as it produced the expected square wave. They were initially pretty confident on this being the source of the problem on last Tuesday evening.
It is not the timing belt. It checked out fine.
They do not think it is a sensor issue since there are no electronic codes coming back so that is why they think it is a timing issue.
A few things they are considering:
1. Non-iridium sparkplugs were installed in the tune-up of the engine.
2. The fuel pump/pressure gauge.
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. The upshot being that 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 that accelerating up to highway speeds is the only thing that seems to cause it. I myself did not notice it while driving it home. Another compication is that there are no error codes.
I just want to know what should be looked at and have this issue resolved.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 27, 2011, 11:17 AM
Post #2 of 11
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Re: 1999 Camry misfires at 4200 rpm
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This engine could be hitting the rev limiter because it thinks it is in Park or Neutral. Tell him to check the transmission ranges sensor.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Hammer Time
Ultimate Carjunky
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Jul 27, 2011, 1:34 PM
Post #4 of 11
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Re: 1999 Camry misfires at 4200 rpm
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No.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
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Jul 27, 2011, 5:11 PM
Post #5 of 11
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Re: 1999 Camry misfires at 4200 rpm
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If your mech is using a high end scanner to view the datastream, what is the misfire count showing when the engine is at the rpm as it is breaking up?
Depending on the load and TPS voltage, the fuel trim might be disabled under heavy acceleration. If it is moderate acceleration and the trim is closed loop, what are your trims.
If they think it is fuel pressure related, they might be able to connect a gauge up and run it up to the windshield. Drive and watch the pressure when it is occurring. Lean under load or high rpm would show up in the trims if in closed loop also.
MAP voltage is going to be high when the pressure in the intake manifold is high or the vacuum is low. That means under heavy acceleration the vacuum in the intake is going to be zero. The pressure is going to be high, so the MAP sensor signal is going to have a high voltage. Is the map reading 5-6 V show when the problem is occurring or just sitting there idling?
Would be nice to see a snapshot of recorded data information when the problem is happening.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 27, 2011, 5:13 PM)
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Hammer Time
Ultimate Carjunky
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Jul 27, 2011, 5:17 PM
Post #6 of 11
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Re: 1999 Camry misfires at 4200 rpm
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LOL........... yeah right.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
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Jul 27, 2011, 5:24 PM
Post #7 of 11
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Re: 1999 Camry misfires at 4200 rpm
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Well, you never know. I had a few surprise me..LOL
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
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Jul 27, 2011, 5:29 PM
Post #8 of 11
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Re: 1999 Camry misfires at 4200 rpm
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OK, that's right up there with Santa Claus and the Easter Bunny..........LOL
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
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Jul 27, 2011, 5:32 PM
Post #9 of 11
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Re: 1999 Camry misfires at 4200 rpm
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What do you mean by that? They are real. I sat on Santa's lap when I was young, so he has to be real. Next thing your going to tell me that it was some drunk dressed up as Santa.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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nwstehle
New User
Jul 27, 2011, 8:40 PM
Post #10 of 11
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Re: 1999 Camry misfires at 4200 rpm
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FOCUS! Sheesh! Just kidding.
It does not appear to be fuel pressure related. They checked the system.
The high MAP reading is under those conditions (4200 rpm and above). it is not while idling or driving normally. Or I think that's the case.
To be honest, I don't know that we ever hit 4200 rpm really. When we came back from Chicago the trip went fine and I noticed nothing out of the ordinary.
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nwstehle
New User
Jul 29, 2011, 4:32 PM
Post #11 of 11
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Re: 1999 Camry misfires at 4200 rpm
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Results from test drive (after current, local mechanic had the vehicle):
1. Transmission shifted late
2. Engine performance poor (bucking and jerking)
3. Spark plug tubes had oil in them
4. Ignition wires were arcing
Fixes:
1. Adjusted transmission fluid level
2. Adjusted kick down linkage
3. Replaced valve cover gasket
4. Replaces spark plug tube seals
5. Replaced spark plugs with iridium plugs
6. Replaced spark plug wires
Observations:
1. Engine performance normal up to 4200 rpm
2. Fuel pressure volume and volume were normal
3. Live sensor readings normal above and below 4200 rpm
4. Lab scope test shows crankshaft sensor pattern appears weak but normal at 4200 rpm
5. Lab scope test showed camshaft position sensor is normal
6. Exhaust back pressure is normal (1-2 psi)
7. Timing alignment is correct
8. Ignition system and coils tested for RFI and they were normal
9. Fuel injectors pulse width drops from 18-20 ms to 8 ms under hard acceleration at 4200 rpm
10. Possible PCM or wiring concern, but no DTCS were stored and there is no other supporting data
11. PCM fine on visual inspection.
No notes regarding MAP sensor or 42% load at idle.
So "misfire" is not an accurate way to describe the trouble observed.
(This post was edited by nwstehle on Jul 29, 2011, 5:03 PM)
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