89 bronco II wont start

[awagner]

i take that as a "nope""should'nt""but hellz yeah" and we will hash out all we learned today on this beast

 

[lil_Blue_Ford]

Yeah. A 6-cyl TFI is a 6-cyl TFI. I ran my truck for 4 years off a TFI from a 91 3.0 Taurus.

Actually I believe the TFI off of a V-8 is also the same part number. If I remember correctly, only the fullsize trucks with the TFI on the inner fender have a different part number.

 

[awagner]

ok changed the tfi and map sensor and still no go. anything else i can change?

 

[awagner]

another thing, we have spark but it is weak. If the timing chain was broke would you still get spark at the plugs? Compression is 115 at 5 cylinders and 110 on one.

 

[adsm08]

No timing chain = no spark.

The chain runs the cam, the cam runs the dizzy, the vane wheel on the dizzy makes the signal for the spark.

Have you replaced your coil yet?

 

[awagner]

No timing chain = no spark.

The chain runs the cam, the cam runs the dizzy, the vane wheel on the dizzy makes the signal for the spark.

Have you replaced your coil yet?

yes put in new coil also

 

[adsm08]

hmm, new TFI, new coil, poor spark....

This is got me over a barrel. Kinda wish I could come look at it myself, it'd be easier to figure out.

 

[awagner]

hmm, new TFI, new coil, poor spark....

This is got me over a barrel. Kinda wish I could come look at it myself, it'd be easier to figure out.

i wish i was in a barrel....this has been a not so fun last few days, no idea what else to try. the only thing i havent replaced is the tps. whould that cause her not to fire?

 

[adsm08]

doubtful, but I suppose it isn't impossible. I've seen dumber things.

Matter of fact, I've seen a shorted TPS cause a no-start on a Crown Vic Interceptor, right off the truck.

 

[awagner]

doubtful, but I suppose it isn't impossible. I've seen dumber things.

Matter of fact, I've seen a shorted TPS cause a no-start on a Crown Vic Interceptor, right off the truck.

how did it act? did it still crank? is there any way to bypass it to try?

 

[adsm08]

it cranked, but it wouldn't catch. The fix was a new TPS, but I highly doubt that this is your problem since it was a much newer car. A lot more stuff depended on that TPS circuit.

Do you have 12 volts to the coil? I'd be far more interested in your weak spark than in other things at this point. If you can get a nice blue spark and it still won't catch then I'd worry about other stuff.

 

[awagner]

coil voltage is good. changed fuel filter and it was full of dirt. how do i check injectors?

 

[kimcrwbr1]

Do you smell fuel on the plugs when you crank on it will tell you if your getting fuel. If your getting fuel and spark it should fire unless you skipped a tooth or two on the timing chain. A weak spark will not ignite the fuel mix either. Check all your grounds to the computer and coil take apart and sand any corrosion or rust away. get a spark plug tester to check out the spark if your not sure you should see a crisp blue snap or just hold it and see if your knees buckle and ur heart stops or just flutters. No dont do that test it hurts and is not very accurate. How many miles does that engine have if it dont have good compression and the cylinders are bad evenly pull the timing cover and check the chain and gears if it is stock it probably needs a chan and cam gear anyway but I always change both gears while you have it apart.

 

[fordrocks1986]

Take them off and take to a parts store and have them tested I'm haveing this same problem its like 15$ a injector for test and new seals this is a pain in the ass for me to

 

[awagner]

ok finally got a code reader and it gave me a system checks good? now i am even more confused