• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

OBD1 code 89 in my 86 2.9l std tranny pickup issues


Joined
May 9, 2018
Messages
64
Reaction score
2
Points
8
Vehicle Year
1986
Make / Model
Ford
Transmission
Manual
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!
 


adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
34,623
Reaction score
3,613
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
MAP sensor could be on the way out. If it is giving bad readings at high throttle that will mess with the fuel calculations.
 
Joined
May 9, 2018
Messages
64
Reaction score
2
Points
8
Vehicle Year
1986
Make / Model
Ford
Transmission
Manual
I guess it cant hurt. Ordered up. Ill let ya know.

Meanwhile this code 89.... any clues on what the heck it is ??
 
Joined
May 9, 2018
Messages
64
Reaction score
2
Points
8
Vehicle Year
1986
Make / Model
Ford
Transmission
Manual
I don't know if that first reply went in so I just ordered a map sensor just in case and why not with a hundred thousand miles on it might need it. Any idea on this code 89? I can't find any information on it and this truck does not have an exhaust heat Riser on it
 
Joined
May 9, 2018
Messages
64
Reaction score
2
Points
8
Vehicle Year
1986
Make / Model
Ford
Transmission
Manual
Well brand new map sensor and still flatlines when i gp full throttle.


ANYONE????
 
Joined
May 9, 2018
Messages
64
Reaction score
2
Points
8
Vehicle Year
1986
Make / Model
Ford
Transmission
Manual
OK 4th Fuel pressure regulator is only giving me 32 psi KOEO, and 28 psi KOER...

I ordered every single fuel pressure regulator form Oreillys, they're the Borg Warner 51 dollar unit, and I'm not stopping until one get's me to 45 PSI minimum.

I can reduce the return fuel flow and get 45 psi and the truck run's tits up to the nines, so I am calling it a regulator issue.

Still no idea on this Code 89 the damn computer is telling me. I'ts a brand new Borg warner EGR valve, and a new EGR vacuum sensor, and this truck does NOT have a Heat Riser solenoid.... nor can I find any evidence of it ever having one.....
 

Paulos

Active Member
Joined
May 7, 2018
Messages
479
Reaction score
210
Points
43
Location
North Carolina
Vehicle Year
1987 STX
Make / Model
Ranger
Engine Type
2.9 V6
Transmission
Manual
2WD / 4WD
4WD
code 89

Code 89 (key on) in the Innova code reader book shows

AXOD Lock-Up Solenoid (LUS) circuit failure or
Clutch Converter Override (CCO) circuit failure or
Exhaust heat control


Code 89 (key on) in the Haynes Ranger manual shows only

Clutch Converter Override (CCO) circuit failure


Hopefully you have an auto trans in your Ranger, as this would explain the code. I've had '86 and '87 Rangers with the 2.9 (but no auto trans) and have never heard of exhaust heat control, or ever seen code 89.

Have you replaced the O2 sensor? Also, I've personally never heard of a FPR on an '86-87 getting more than 39-40 PSI. If you got 39 it should be more than sufficient.

I just noticed the title in your first post staing you have a standard trans. Maybe the computer you have is for an automatic trans Ranger.
 
Last edited:
Joined
May 9, 2018
Messages
64
Reaction score
2
Points
8
Vehicle Year
1986
Make / Model
Ford
Transmission
Manual
It is a 5 speed standard transmission you look up the codes and it says heat Riser control solenoid there is a third one if you look up OBD1 specs....


This did not have a converter of any type :)
 
Joined
May 9, 2018
Messages
64
Reaction score
2
Points
8
Vehicle Year
1986
Make / Model
Ford
Transmission
Manual
I've put in FIVE new BW fuel pressure regulators. It sits at a solid 38 psi key on engine off, it drops to 27-28 psi with engine running and vacuum line hooked up.

Everything I can find said 35 to 45 psi.... How can i achieve this?
 
Joined
May 9, 2018
Messages
64
Reaction score
2
Points
8
Vehicle Year
1986
Make / Model
Ford
Transmission
Manual
It's NOT the lift pump, if it was, then I wouldn't get the pump to push over 70 psi when I gently restrict the return line.....


I need ideas folks 8)
 

rusty ol ranger

Im a Jeep guy now.
Supporting Member
Joined
Sep 22, 2007
Messages
12,267
Reaction score
7,274
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
177 CID
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
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?
 

JerryC

Active Member
Joined
Apr 10, 2014
Messages
270
Reaction score
56
Points
28
Location
Tennessee
Vehicle Year
1988
Make / Model
Ford
Engine Size
2.9
Transmission
Automatic
Ditto on the fuel filter, my 88 has two of them.
You tried several regulators but have you tried a different gauge?
 

bobbywalter

TRS Technical Staff
TRS Event Staff
V8 Engine Swap
TRS Technical Advisor
TRS Banner 2012-2015
TRS 20th Anniversary
Ugly Truck of Month
TRS Event Participant
Joined
Aug 9, 2007
Messages
23,470
Reaction score
4,667
Points
113
Location
woodhaven mi
Vehicle Year
1988
Make / Model
FORD mostly
Engine Type
V8
Engine Size
BIGGER
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
sawzall?
Tire Size
33-44
My credo
it is easier to fix and understand than "her"
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:icon_surprised: 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.
 

Sponsored Ad


Sponsored Ad

Members online

Today's birthdays

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Latest posts

Truck of The Month


Kirby N.
March Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top