Car has a dead spot at part throttle.

ALLAND

MEMBER
2001 SATURN SL1
180,000 MILES

It feels like a wire or open circuit problem. It only happens at a certain throttle position, above that position it runs well and at idle, it misses intermittently. There are no codes set in memory and the ck eng lite is off. I replaced the fuel pump, 50psi constant pressure, Engine vacuum is 20in at idle, TPS, plugs, MAP sensor, PCM, Crank sensor fuel injectors fuel filter, coils, ignition module. And still have this problem. My volt meter reads 14.2 volts. I moved the relays around in the fuse box checked all the ground connections. I had a volt meter on the injector power side nothing shows up on any test. Any help would be appreciated

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Check the TPS closed and wide open throttle voltages

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Tuesday, November 15th, 2011 AT 8:27 PM

SATURNTECH9

MECHANIC
30,869 POSTS

Just to add to this one the miss at idle is probably caused by the intake gasket leaking around the number 1 or 2 cylinder by the power steering pump area. Very common on those cars the gaskets were wrinkled when they were installed at the factory.I have replaced a ton of them. Most the time you can see the gasket wrinkled. As far as the dead spot in the throttle I would suspect the coolant temp sensor and connector to it being corroded. Also very common on those cars.