Heat risers were used on carburated engines to help open the choke. No idea why you would be getting that code off a 2.9.
You change your fuel filter?
2.9 has a heat riser for cold starts. but should not code, as its a mechanical bimetal sytem vac switch with vac motors..like many eec4 systems.
bad pcm or wrong pcm possible though...
I'm getting code 89, which is Exhaust Heat Control (heat Riser) solenoid circuit
I cannot find this on my truck, I cannot find info on it anywhere, maybe you fellas can lend a hand.
Engine bucks at any throttle over 2/3 rds. full throttle falls on it's face...
New TPS, New EGR, new EGR sensor, New Fuel pump 39# constant (second fuel pump in a row), New (third in a row) Pressure regulator.
Any thoughts?
Free flowing exhaust, it's not a clogged catalytic converter, this is a throttle issue somehow, it's not popping, it's Bucking basically anything past half throttle...
Thanks fellas!
holy fawking fawk
i feel for ya brother... seems you probably narrowed things by restricting the return line to raise pressure and it ran correctly...or better as it were. going to an aftermarket inline regulator may workout ok....like this......
https://www.summitracing.com/parts/tnk-afpr1?seid=srese1&cm_mmc=pla-google-_-shopping-_-srese1-_-tanks-inc&gclid=EAIaIQobChMI9veQps-O2wIVT1uGCh2pYglAEAQYAiABEgLCU_D_BwE
or maybe not. the low fuel psi (unless your gauge is inaccurate) could simply be low voltage..which will burn the wires or pump up eventually by increasing the psi/load...
but please remember...
....even if you empty the parts store, its not going to fix a wiring or incorrect pcm issue or incorrect timing or crossed ignition wires.... or wiped out cam lobes...shit valves or wiped pushrods, plugged or wrong injectors ect...
if the the plug wires are bad or crossed or the cap/dizzy reluctor is fawked or it has the wrong tfi....new fuel injectors because yours are clogged to the max... i guess someone can get lucky when they get to buying those...but that is a painful amount of wasted cash.
could be a simple large vacuum leak which could read as a bad map sensor or hamper fuel pressures....
i would suggest you...buy and learn how to use a dvom.
get a vacuum gauge
study the spark plugs
were you having wild swings with fuel pressure this whole time? without doing proper fuel pressure load and volume testing i cant imagine buying any parts unless obviously dead... what your investing here is perplexing. would suk if they are just giving you the wrong part...
New TPS,
why? was it erratic on a meter test?
New EGR, new EGR sensor,
were these tested?
the valve hanging can cause some stumble and actually some of what your describing...one way i test.....slam it shut for testing or put a plate to block it off to make sure...but i am not thinking this is an issue.. you will actually get stumble when its closed and the sensor reads open as the engine rates fuel and ignition for the egr flow...
you can bridge it with a resistor to delete it. the eec4 is really robust and minimal ..
New Fuel pump 39# constant (second fuel pump in a row),
well these damn things are sometimes dead in the box..so i can see running through a few. but as long as your holding 33 psi at wide open throttle you have plenty of pressure...now volume is a whole different issue. are you using a gauge you can monitor driving under load?
volume test can be key here, poor wiring can cause a volume deficiency under load with good psi on idle testing and even load test for short periods...shitty grounds or just corrosion can cause it...bad connection through the rollover switch can cause power delivery issues. when i suspect it i run a temporary clean power setup to eliminate the possibility of it causing diagnosic issues. of course a proper voltage drop test can be effective but i just bridge it with direct wire system fused of course when in doubt.
New (third in a row) Pressure regulator.
so your new fpr kept failing and dumping fuel into the intake? or were you just loosing pressure at wot?
with a vacuum gauge on it, whats it look like...??? there are tons of pictures and write ups on how to use the vacuum gauge and read plugs.