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Engine quits @5 psi boost after dealer service

Old 05-02-19, 11:39 AM
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Engine quits @5 psi boost after dealer service

1993 FD MT, 187,000 miles (44,000 miles on 3rd engine). I don't work on my car.
Last week I had the following preventive maintenance done at a Mazda dealer: change engine oil & filter, change transmission and differential oil, new fuel and air filters, flush cooling system, new radiator (engine runs 15 degrees cooler), new coolant thermostat, new metal AST, new radiator/heater hoses, compression test (118 psi, 116 psi), new spark plugs/wires, inspect fuel injectors & pulsation damper for leaks (none found), test flow rate of OMP (OK), new belts, new O2 sensor (Bosch). They also replaced a bad throttle body gasket. Upon driving the vehicle after this service, I found that the engine would sputter and stumble badly and lose all power in 2nd, 3rd, 4th gears at ~5 psi boost on my boost gauge, as if its not getting any air/gas. Lifting off throttle restores normality. Engine runs fine otherwise. This problem has never happened before. Dealer has had car last two days but is clueless.
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Old 05-02-19, 01:09 PM
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Well they touched a lot of stuff. It sounds like it could be in limp mode. Even if you don't have a check engine light I would check for codes.
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Old 05-02-19, 01:27 PM
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Do you have the invoice to post and do you have a Wideband O2 sensor?
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Old 05-02-19, 10:00 PM
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Thats a lot to troubleshooting to do.
Vacum leak,?
Spark issue?
Fuel system issues?
Check to see if its in limp mode as suggested.
Look for anything lose.


Never take your car to the dealer.. lesson learned.
Good luck man..
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Old 05-17-19, 06:52 AM
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Three different dealer mechanics from two different dealerships were unable to fix the problem over a two-week period.

I went to Banzai Racing. In an hour and a half they found and replaced several flaky check valves and vacuum lines, which fixed the problem.
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Old 05-17-19, 08:30 AM
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Glad you got it sorted.
I remember checking voltage and checking nozzles by blowing thru them, but didn't know the actual flow rate of the OMP could be tested.
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Old 05-17-19, 08:46 AM
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Glad I could get it sorted out for you.
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Old 06-21-19, 02:37 AM
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Dealerships aren't the way to go.
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Old 07-08-19, 07:53 PM
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Originally Posted by will7 View Post
Dealerships aren't the way to go.
Especially with a rotary
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Old 07-10-19, 12:42 PM
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Originally Posted by RotaryJohn View Post
Three different dealer mechanics from two different dealerships were unable to fix the problem over a two-week period.

I went to Banzai Racing. In an hour and a half they found and replaced several flaky check valves and vacuum lines, which fixed the problem.
Recommend Banzai Racing. I've used them before and they know what they're doing!
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