89 454 tbi problems and ?'s
 

Ok so here goes nothing.

Having problems with it running rich. At first I thought the injectors were suppose to spray constant but now I have read they should pulse.

Iac good map good tps good. My injectors spray a good pattern they just spray all the time with no pulsing except during cranking.

Can someone help me out.
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Re: 89 454 tbi problems and ?'s
 

Mine don't really seem to pulse either, unless it's very slight. On cold start I can smell fuel from 50 feet away it's so rich. But truck runs all right so I've just let it ride. I have cell phone video of it but can't post.
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Re: 89 454 tbi problems and ?'s
 

The pulse is constant and quick, it almost appears continous but it is detectable if you stare at it. I would check the O2s and install a 3 wire (pre-heated) if you don't have one.

Re: 89 454 tbi problems and ?'s
 

The o2 sensor is one code it's throwing cause I have a leak in the manifold causing air to be sucked in and the sensor to read lean. Found that out about 3 hours ago when a ses light came on. Found crack after it cooled down.
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Re: 89 454 tbi problems and ?'s
 

I have a bad temp sensor on the front of my block on my '88 chevy TBI motor. Would cause it to stay running rich n kinda high idle thinking that it needed more fuel then it actually did. Might be worth a shot its easy and cheap. Its the sensor in the very front of the intake that threads into it. Have you ever messed with the timing on it before?

Re: 89 454 tbi problems and ?'s
 

No I haven't messed with timing. I did replace the temp sensor but it was closer to the front of the engine than than how u described it.

Can someone send me the firing order of the cylinders in case I replace cap and rotor etc. really considering a carb swap with long tube headers.
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Re: 89 454 tbi problems and ?'s
 

The firing order and rotation are cast into most factory intakes for future reference.

18436572 clockwise, the #1 plug wire is USUALLY located on the cap closest to the front to the passenger side. The driver's side cylinders are 1,3,5,7 from front to back, passenger's side 2,4,6,8.