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4.5 stroker HELP PLEASE!

Performance mods and Advanced Stroker discussion.
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nojajeep
Posts: 2
Joined: April 1st, 2018, 7:50 am
Stroker Displacement: 4.5
Vehicle Year: 1988
Vehicle Make: jeep
Vehicle Model: wagoneer

4.5 stroker HELP PLEASE!

Post by nojajeep » April 1st, 2018, 8:32 am

short story. what i thought was an 88 turned out to be a 94 head. but either way it was run as a renix. i built the poorman's stroker and installed it yesterday. the engine purrs like a kitten at idle. 4.2 crank and connecting rods into the 4.0.

it will not accept any throttle. whether i feather the throttle or slam the throttle, the engine starts to spit/sputter/choke/backfire.

ive double checked the distributor to make sure its just past plug one. i have changed the tps to make sure that wasn't it. i am running 1 therm hotter plugs. fuel pressure is at 40+ lbs.

anyone have any ideas whats going on? :( my sons dream project has failed!

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Cheromaniac
Senior Member
Senior Member
Posts: 2610
Joined: March 8th, 2008, 12:58 pm
Stroker Displacement: 4563cc
Vehicle Year: 1992
Vehicle Make: Jeep
Vehicle Model: Cherokee
Location: Cyprus
Contact:

Re: 4.5 stroker HELP PLEASE!

Post by Cheromaniac » April 1st, 2018, 12:12 pm

You could have a clogged fuel filter or bad fuel pump. Does the fuel pressure drop when you open the throttle?
1992 XJ 4.6 Stroker - 5MT - 202rwhp/258rwtq - Sold 13/12/2016 :cry:
Stroker build-up, Stroker "recipes"
2006 Mustang 4.6 GT - 5MT
- 311rwhp/328rwtq - Midlife crisis car :D
A few bolt-ons

nojajeep
Posts: 2
Joined: April 1st, 2018, 7:50 am
Stroker Displacement: 4.5
Vehicle Year: 1988
Vehicle Make: jeep
Vehicle Model: wagoneer

Re: 4.5 stroker HELP PLEASE!

Post by nojajeep » April 2nd, 2018, 8:14 am

Cheromaniac wrote:You could have a clogged fuel filter or bad fuel pump. Does the fuel pressure drop when you open the throttle?

the fuel stays between 40-45lbs though-out throttle.

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Cheromaniac
Senior Member
Senior Member
Posts: 2610
Joined: March 8th, 2008, 12:58 pm
Stroker Displacement: 4563cc
Vehicle Year: 1992
Vehicle Make: Jeep
Vehicle Model: Cherokee
Location: Cyprus
Contact:

Re: 4.5 stroker HELP PLEASE!

Post by Cheromaniac » April 2nd, 2018, 11:09 am

Check the voltage sweep of the TPS from closed to wide open throttle. It should rise linearly with no spikes or troughs.
If that checks out OK, something could be wrong with the distributor synch.

sly-jeeper
Donator
Donator
Posts: 150
Joined: December 29th, 2013, 9:17 am
Stroker Displacement: 4.6L
Vehicle Year: 1994
Vehicle Make: jeep
Vehicle Model: cherokee
Location: Kaleva, mi

Re: 4.5 stroker HELP PLEASE!

Post by sly-jeeper » April 4th, 2018, 6:07 am

I tried to help this guy on Facebook, referred him to here, showed him cruiser54 page on TPS adjustment, and had him post on my Facebook page jeepstroker's4.xxx Seems to be that he's avoiding great advice and isn't willing to work or stay in contact with people who make attempts at trouble shooting over the internet. :huh:

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