New 4.7 starts but but won’t run over 1000 rpms.

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Team Fred
Posts: 3
Joined: September 12th, 2020, 2:42 pm
Stroker Displacement: 4.7
Vehicle Year: 1989
Vehicle Make: Jeep
Vehicle Model: Cherokee

New 4.7 starts but but won’t run over 1000 rpms.

Post by Team Fred »

I’ve just assembled my first Stroker in my 1989 XJ
I sourced my parts through Russ Pottenger. 7120 head.
99+ intake. BBK throttle body. Running the stock renix ecm.
The motor fired right up but hesitates and runs rough as soon as the throttle body is opened.
Fuel pressure holds steady at near 40lbs. I’m stumped all sensors worked well last week when I pulled the old motor. Any advice will be appreciated. Thanks in advance!
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Cheromaniac
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Posts: 3180
Joined: March 8th, 2008, 12:58 pm
Stroker Displacement: 4563cc
Vehicle Year: 1992
Vehicle Make: Jeep
Vehicle Model: Cherokee
Location: Cyprus
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Re: New 4.7 starts but but won’t run over 1000 rpms.

Post by Cheromaniac »

Check the TPS and MAP sensor. Also make sure the vacuum line to the MAP sensor is intact.
Team Fred
Posts: 3
Joined: September 12th, 2020, 2:42 pm
Stroker Displacement: 4.7
Vehicle Year: 1989
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: New 4.7 starts but but won’t run over 1000 rpms.

Post by Team Fred »

Crank position sensor. Thanks for the reply. The motor is alive and I am impressed!
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