P1604 Startability Malfunction

[Hempo]

Had my heads polished and fixed after i blew a valve last summer. And now when all is put together and i try to start the engine cranks but wont start. I get the code P1604 Startability Malfunction and i've felt that the headers are warm only the ones coming from cylinder 2-3. 1 and 4 are cold..

I've checked so the sparkplugs "spark" and they are not dry.

Anyone have any ideas?

Sorry for bad english.

[zkv476]

I found info on this on another forum relating to Toyotas, and it appears to be a generic code. Technically the code doesn't even turn the CEL on, it's probably set by extended cranking and no start. Unfortunately it doesn't directly correlate to an issue with a component. It's meant as a freeze frame data point to check other pieces of information.

I would triple check all connections and make sure everything looks right. It's odd that cylinders 1-4 and 2-3 seem different, seeing as how they're not even on the same head.

This DTC is stored when the engine does not start even though the STA signal is input or when the engine takes a long time to start, and when the engine speed is low or the engine stalls just after the engine starts.

Using the Techstream, the conditions present when the DTC was stored can be confirmed by referring to the freeze frame data. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.

It is necessary to check if the vehicle ran out of fuel before performing troubleshooting, as this DTC is also stored when there is engine starting trouble due to running out of fuel.

HINT
* In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P1604 is used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as starting difficulty.
As these DTCs can be stored as a result of certain user actions, even if these DTCs are output, if the customer makes no mention of problems, clear these DTCs without performing any troubleshooting and return the vehicle to the customer.
* If any other DTCs are output, perform troubleshooting for those DTCs first.
* When the Data List item "Immobiliser Fuel Cut" is ON, the engine cannot be started.
* Read freeze frame data using the Techstream. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.
* When confirming the freeze frame data, be sure to check all 5 sets of freeze frame data See: Computers and Control Systems > Scan Tool Testing and Procedures > Freeze Frame Data.
* When confirming freeze frame data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.
* Try to start the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and compare it with the freeze frame data.
* If the malfunction does not reoccur, carefully check the vehicle conditions from when the malfunction occurred using freeze frame data.
* When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.
* If the same inspection or replacement procedure appears 2 times when performing an inspection procedure, it is not necessary to repeat the procedure the second time.

[Hempo]

Originally Posted by zkv476

I found info on this on another forum relating to Toyotas, and it appears to be a generic code. Technically the code doesn't even turn the CEL on, it's probably set by extended cranking and no start. Unfortunately it doesn't directly correlate to an issue with a component. It's meant as a freeze frame data point to check other pieces of information.

I would triple check all connections and make sure everything looks right. It's odd that cylinders 1-4 and 2-3 seem different, seeing as how they're not even on the same head.

Yeah i know it's weird that the problem occurs on different sides :P But i'm happy that cylinder 1 seems to fire since that's where i blew a valve last summer.

The car is running on E85 and the DW700cc injectors i had has been removed and cleaned, but not the other 4. Could this be an issue that makes the car not wanna start?

[steve99]

Originally Posted by Hempo

Yeah i know it's weird that the problem occurs on different sides :P But i'm happy that cylinder 1 seems to fire since that's where i blew a valve last summer.

The car is running on E85 and the DW700cc injectors i had has been removed and cleaned, but not the other 4. Could this be an issue that makes the car not wanna start?

As the first guy said that code is generic just means engine did not start despite repeated starting attempts

Sounds like your boosted ?, assume you injector scaling has been adjusted in tune to suit uprated injectors ?

hopefully the e85 in the tank was sealed and not open to atmosphere to absorb water while car was repaired.

check maf sensor is clean and no insects built nest or something on sensor

Check maf sensor is clean